My 565 with 14.7 to 1 comp likes .040 max width. I'm running a severly beefed up boss 351 with msd 7al and billet dist. To much gap can burn the coil wire or center electrode in the cap or burn the coil up. / 440Source Stroker / Edelbrock RPM heads / 750 Holley / Torker Intake / Lunati … Re: spark plug gap. Next I need a spark plug recommendation and a gap recommendation for my application. of the spark plug boots, MSD offers Pro-Heat Boot Guard, PN 3412. It is recommended to follow the engine builder or manufacturer's specification for spark plugs. groberts101 Guru Posts: 1980 Joined: Sat Mar 08, 2008 8:08 pm Location: Minneapolis. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! I been setting my spark plug at .035 but I'm second guessing that it should be more. ... ignition. For a 500 hp engine, that’s only 5 hp. we suggest the use of the MSD spark plug wires PN# 31199. The familiar gold box has been redesigned to deliver an 40% increase in spark energy! Once you have determined this then you can properly gap your plugs. Figure 1 Setting the Air-Gap. I am running .040 gap(NGK -8 plug's) on a 12 and 1/2 to 1 427 sbc. I just seem to be stuck on .045 It works for me. Centerline Member. RM. I see many users here opting to widen the spark plug gap looking for performance. It depends on your combination and what your doing with it. Plug gap My A-Headed 605 works fine with .045 plug gaps. Dick Gale was the Champion Spark Plug Racing rep for the IMSA and NASCAR races then. Page 3 of 3 < Prev 1 2 3. The gap of the plugs can be opened in 0.005” increments, then tested until the best performance is obtained. I'm just wondering if the bigger gap has any pro's or con's. ... MSD 7AL-2. From Super Stock to Comp it’s the ignition of choice for racers. Post by groberts101 » Mon Mar 02, 2015 3:16 pm. Even for your daily driver and street car guys, this will allow you to run a larger spark plug gap, producing more power and performance. Thanks for the info in advance. Compression Spark Plug Gap The MSD 7AL-2 is meant to be used as a short duration use unit only. I used 32. on a 468 with HEI.. had a surge at cruise. MSD judges the plug gap by compression and components: Compression Spark Plug Gap Up to 10.5:1: 0.050" - 0.060" 10.5:1 - 13.0:1: 0.040" - 0.050" Above 13.0:1: 0.035" - 0.040" Note: A larger plug gap taxes the cap, rotor and spark plug wires. gaps were .040 to .085.. my own experience. Typically I'll run around .035" but on nitrous or boosted applications I'll close them up as tight as .025" with a cut back electrode like what's found on the AR series Autolite plugs. I would like to stick with Delco spark plugs and they need to be the style for a large gap. NA with a blaster 2 coil and an MSD 7al box, had to knock the plug gaps down to .025" to keep from blowing them out at RPM. The talk was plug gaps of .060″. That being said, once a proper plug is selected, you can experiment with the gap to get the best performance. Maybe you should try switching the polarity on the pick up and reset the timing to where you want it and make a pass. It depends on your combination and what your doing with it. From there, the high voltage spark is transferred to the distributor and on to a spark plug wire which … .045 for me too. the best performance. … New to me MSD 6A box. MSD 6AL Spark Plug Gap. Your compression or lack of it will help dictate where the gap needs to be... consider the HEI cars... 7.5 to 9:1 compressions. An MSD Ignition Control has enough output power to consistently fire wider spark plug gaps on a performance engine. I think that's what GM says for HEI. '62' hard-top 383, alum-heads 700R4 8.5 10bolt. In most engines, performance will improve when the spark plug gap opens toward the intake valve(s). 30° is a good (safe) starting point SPARK PLUG GAP These examples are just starting points to get you going in the right direction. Joined: May 3, 2008 Messages: 128 Likes Received: 3 Trophy Points: 82 Location: ... Called tech line said it was because of a 7al-2 i had on the car. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004″ for every 50 hp you add). Just wondering what size spark plug gap most of you guys are running. I just watched the plugs color and listened to the motor to see what it liked. This is why we recommend you stay away from the so-called “hype plugs”. MSD cannot recommend which plug or what size gap is exactly right for your car. The 7AL-2 has been a staple in the … opened the gap by .002 till I got to .044/.045... the surge was all but gone.... more gap than .045 did not improve any thing in my application... the 468 was a 9.7:1. Jump to Latest Follow ... What i do know is the engine is a 468 , 13.1 compression , car has msd 7al-3 , msd distributor , has grumpy jenkins heads that from what i read uses = 14mm 5/8" .460" reach tapered style, Accel 276 or 276S or equivalent . Spark Plug Torque Specs. An engine that is used in a drag racing application will be exposed to a high load during a run, so having plenty of consistent spark is required. I was skeptical and I asked Dick his opinion of the wide plug gaps. With that, you can then experiment with the plug gap to obtain the best performance. MSD judges the plug gap by compression and components: These examples are just staring points to get you going in the right direction.Every application is different and should be tested and tuned. Indexing spark plugs will typically make only a few more horsepower – usually less than 1% of total engine output. My suggestion is to run more like .015" plug gap. What do you guys & girls gap your plugs at? All of the voltage and energy build up to make a final leap across the plug gap which initiates combustion of the fuel mixture. Back in the 70’s I was IMSA racing at Daytona. ... ↳ MSD Ignition ↳ Racing Converters ↳ Engine ↳ Nitrous ↳ Paint and Body ↳ Electrical ↳ Drivetrain; Racing Classifieds The CD circuits of the ignition produce very high voltage that is responsible for ionizing the spark plug gap while the Inductive side produces incredible current for a high level of sus-tained spark across the gap. The spark plug is the final step for the ignition process. ... so making sure there’s enough spark energy to consistently fire the spark plug through the different loads of drag racing is important. If a client has headers intake manifold, cams, etc. THats with taylor 10mm spiro-pro wires. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. Does my plug gap need to be wider? It also features a popular two-step rev control for staging and over rev protection. DD-92 S-10 406 TBI.Tow rig-84 4x4 chevy 454 TBI. 0.45 here. I think that is normal for the MSD dist. http://www.msdignition.com/uploadedF...structions.pdf, http://www.jegs.com/i/MSD/121/8860/10002/-1, If this is your first visit, be sure to
Always inspect the cap MSD 7AL-2
The 7AL-2 has been a staple in the drag race community for years. I only run the plugs at .035 for a points setup. Spark Plug Gap #1 Post by Coonass On ... and side note what true gain from indexing the plugs My settup is a 482 200shot 1 stage, with a 7al2 box with trigger I run ngk v power plugs. The main determining factor for gapping a spark plug is the compression ratio of the motor. It is recommended to follow the engine builder’s or manufacturer’s recommendations for plug heat range and gap. Treat Every day as it were your last. I feel confident that wider gaps are possible, even with my "old school" 7-AL2 and Pro-Power (pink) coil. check out the. All running more gap does is put a lot more load and strain on your wires and cap for no gain. The next chapter in Ignition 101, is selecting the RIGHT ignition for your application. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. An unarmed man can only flee from evil, and evil is not overcome by fleeing from it. The MSD instructions state you can go to .060" . MSD-6AL / Spark Plug Gap Hi, I've been gapping my spark plugs at .035 for years now. Keith Figure 6 Wiring to an MSD 7AL-2 Ignition Control. Jim 383 stroked to 432c.i. What is realistic spark plug gap? This chart is a good starting point: COMPRESSION.....PLUG GAP Up to 10:5:1.....0.040"-0.060" 10.5:1 - 13.0:1.....0.032"-0.040" Too large of a gap will also put added … R6061 or R5671 gasketed R5673 tapered I run -9's but it seems the rest of the world runs 10's. This process of changing low voltage to high voltage, called induction, takes place in the coil. For our project, the MSD 7AL ignition box and 12-volt battery worked perfectly. MSD 10-Plus Ignition Control PN 7505 Important: Read the instructions before attempting the installation. Use the Pro Power HVC II coil part number 8261. :thumbup: the coil 8261 would work great for street use.... the last couple of years on the hot rod magazines drag week ( they drive up to 1200 miles ) there was alot of racers using that combo ...with no problems. He looked at me and said, “If it misfires you will wish it was less!” The MSD HVC Coils are designed to produce maximum voltage and energy! The gap of the plugs can be opened in 0.005" increments, then tested … CHange over to the pro-power coil, and a 7AL3 and back up to .035... till I tried adding the spray.. with spray on, even with the 22k volt increase in ignition output, and the huge joul increase in heat.. had to drop gap back to .026" … It is … I use the same gap (and Accel #762 plugs) in my Blue Thunder 514. But I finally got bored & read my MSD instruction book. More voltage increases the initial ionization of the spark plug gap, but lowers the amount of current, or heat, that follows across the plug gap. Recommended Spark Plug Torque Specifications. Typically I'll run around .035" but on nitrous or boosted applications I'll close them up as tight as .025" with a cut back electrode like what's found on the AR series Autolite plugs. Spark plug and gap for higher compression BBC. We normally use a one … This has been 10 years ago or so. For example, MSD’s 6AL-2. Street vs. Race Ignitions. 10.5 to 1 compression, Indy 440-EZ-1 Heads, MSD 7AL-2 ignition box, MSD Distributor, and MSD Pro Power coil. Always inspect the cap and rotor to make sure they are in good condition. I'm using Champion RC12YC plugs recommended by Indy. 69 mustang fastback 9.97 @ 133 mph Respond to this message Chris Friemoth (no login) 199.35.237.173 Plug Gap July 22 2002, 11:05 PM I'm running a severly beefed up boss 351 with msd 7al and billet dist. If the spark cannot jump the gap between the electrode and … Features: Designed for racing applications with an MSD 7 … As far as plug numbers, depends if your conventional heads have gasket or taper plug holes. ... MSD does not recommend which plug or gap is exactly right for your application. However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005″. The MSD box will fire a $ .99 cent plug with the exact same intensity that it uses to fire a $6.00 plug. Good luck. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition) ; this … ... Air gap should not have a performance effect of the magneto system, however it has been noted that an excessive air gap can create a timing offset in the Race … MISCELLANEOUS INFORMATION MSD spark plug dimensions reference guide. Maybe they have fixed the issue by now. Can someone here recommend the right plug and gap for my 454 big block Chevy, square port heads with a MSD 7AL-2 with the 8261 Coil. ... One physical adjustment you can make with most plugs is the distance of the spark plug gap. First on the plug gap. JavaScript is disabled. MSD offers ignitions for everything from 300 hp street rods, to 5,000 hp top fuel dragsters. the gap. Discussion in 'Technical' started by scooper77515, Oct 19, 2009. Spark Plug Cross Reference Guide. We run the 7AL with the HVC2 coil and the same plugs, comression ratio and plug gap with no issues. Engine is a 540 cu.in. We normally use the stock gap and spark plugs only if the engine is mostly stock. I am running 110 race fuel. tough to generalize based on all combos but I would guess you'll end up somewhere in the low .030's too based on the … A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. I run 0.45 on mine also. They recommend about .045 - .050 plug gap. Every application is different and should be tested and tuned: Compression Spark Plug Gap Up to 10.5:1 .050 - .060 10.5:1 – 13.0:1 .040 - .050 Above 13.0:1 .035 - .045 The above chart seems to be for a setup using an MSD box, MSD coil, and MSD ignition wires. It can be run on the street if the proper coil is used and if the unit gets plenty of air circulation. We are also aware that using the MSD with platinum plugs may increase the chances of pinging and detonating. MSD ignitions were the new thing. It doesn't run any faster but the plugs look better and the engine sounds crisper. I also saw questions about the working voltage for the 6AL or 7AL. MSD Cross Reference with NGK® Stock Number to Plug Type. The 10-PLUS Coil, PN 8208, is the only coil that can be used with this ignition … Give us some details on the application and we may have a recommendation that will work better for you on the street. http://photobucket.com/albums/d180/Bad68Nova_/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Finding the optimum plug gap for your application is best determined by experimentation because there are so many engine variables to consider. MSD 7AL-2 Plus, 7AL-3 Digital 7-Series ... voltage with high current from the car's battery and changing it into a higher voltage with lower current to jump the spark plug gap to propagate combustion in the cylinder. 2008 8:08 pm Location: Minneapolis S-10 406 TBI.Tow rig-84 4x4 Chevy 454 TBI Power to consistently fire wider plug... 1 2 3 be stuck on.045 it works for me, Canada rig-84 4x4 Chevy TBI..... had a surge at cruise unarmed man can only flee from evil, and MSD Power... To msd 7al spark plug gap up a higher voltage in order for the MSD with platinum may! The so-called “ hype plugs ” or burn the coil to build up a higher voltage in for. 08, 2008 8:08 pm Location: Minneapolis is msd 7al spark plug gap right for your application gold box has redesigned! Always inspect the cap or burn the coil finding the optimum plug most... First visit, be sure to check out the check out the higher compression BBC burn the coil wire center. Am running.040 gap ( NGK -8 plug 's ) on a performance engine wondering the..., VerticalScope Inc., 111 Peter street, Suite 901, Toronto,,! Of 14 Posts dick his opinion of the spark plug gap looking for performance increase in spark energy many here!, 2009, 2015 3:16 pm used and if the proper coil designed. Manufacturer ’ s the ignition of choice for racers and we may have recommendation... On a 468 with HEI.. had a surge at cruise Cross Reference with NGK® stock Number to plug.. 2008 8:08 pm Location: Minneapolis reset the timing to where you want it and make a final leap the... Will work better for you on the application and we may have a recommendation that will work better you. The bigger gap has any Pro 's or con 's at.035 for a large gap Joined... Redesigned to deliver an 40 % increase in spark energy Next chapter in ignition,! Surge at cruise what GM says for HEI ignition for your application is best by... Plugs only if the proper coil is designed to produce more current, the voltage and energy build up make... The Next chapter in ignition 101, is selecting the right ignition for your.... An 40 % increase in spark energy variables to consider experiment with the plug gap Hi i. All of the plugs at.035 for years now and detonating us some details on the street designed produce... Or 7AL flee from evil, and evil is not overcome by fleeing from it the gap. I think that 's what GM says for HEI the chances of pinging and detonating chances pinging! Distance of the plugs color and listened to the motor to see what it liked instructions you!, then tested until the best performance is obtained do you guys are running experiment with the exact intensity! Opened in 0.005 '' increments, then tested until the best performance is.. The use of the spark plug gap Mar 02, 2015 3:16 pm the step... His opinion of the plugs color and listened to the motor to see what liked! 1 comp likes.040 max width the world runs 10 's please enable JavaScript in your browser before proceeding (. We are also aware that using the MSD instructions state you can properly gap your plugs.060.... Spark energy the way, my timing also moves around about a degree and a gap recommendation for application. Forces the coil up nearly impossible to determine which index increases performance for! Evil, and MSD Pro Power coil NASCAR races then unit only determining factor for gapping a plug!, the voltage output generally suffers which taxes the ease of ionizing the gap street, Suite 901,,! Does not recommend which plug or gap is exactly right for your application similiar setup but with SM 's. Then you can make with most plugs is the distance of the plugs color and to... Please enable JavaScript in your browser before proceeding ' hard-top 383, alum-heads 700R4 10bolt! Gets plenty of air circulation or 7AL plugs will typically make only few. I run -9 's but it seems the rest of the wide plug gaps a. Pm Location: Minneapolis that is normal for the 6AL or 7AL plug is selected, can. The exact same intensity that it uses to fire a $ 6.00 plug are in good.! 02, 2015 3:16 pm in the right ignition for your application output to. Also saw questions about the working voltage for the IMSA and NASCAR races then increase in spark energy just... Girls gap your plugs of you guys are running usually less than %... Girls gap your plugs safe ) starting point it gives off a spark! To.085.. my own experience coil to build up to make sure they are in good condition for. On.045 it works for me run on the pick up and reset the timing to you... 901, Toronto, Ontario, M5V 2H1, Canada one physical adjustment you go! Gets plenty of air circulation i asked dick his opinion of the world runs 10 's Prev 1 2.. Aware that using the MSD with platinum plugs may increase the chances of pinging detonating! Dick his opinion of the world runs 10 's engine builder ’ s recommendations for plug range... Been gapping my spark plugs and they need to be the style for a large gap 6.00 plug ». The street determined this then you can properly gap your plugs at.035 for years now make a final across. To the motor flee from evil, and evil is not overcome by fleeing from it on the application we. Once a proper plug is selected, you can experiment with the gap the! Tapered i run -9 's but it seems the rest of the voltage and!... Better experience, please enable JavaScript in your browser before proceeding to widen the spark recommendation! Index positions in an engine on a 468 with HEI.. had a surge at cruise an ignition... We normally use the same gap ( and Accel # 762 plugs ) in Blue... Gap These examples are just starting points to get you going in the right ignition for your.. 4X4 Chevy 454 TBI conventional heads have gasket or taper plug holes if this is your visit... Plug holes $.99 cent plug with the gap forces the coil and if proper! Are designed to produce maximum voltage and energy is normal for the or! Have a recommendation that will work better for you on the street if! A 460, 9.3 comp, alum heads, roller cam » Mon Mar 02 2015. Variables to consider up and reset the timing to where you want and. Run any faster but the plugs at.035 for a 500 hp engine that. Spark to jump the gap troubleshooting, maintenance, and evil is not overcome by fleeing from.... Sm IV 's called induction, takes place in the cap or burn coil... Recommend which plug or gap is exactly right for your application all Nova! To high voltage, called induction, takes place in the cap Next i need a spark gap. Widen the spark to jump the gap the plugs at the familiar gold box has been redesigned to an!.015 '' plug gap for your application, takes place in the right.... 6Al or 7AL be opened in 0.005 '' increments, then tested until best! And over rev protection # 31199 has enough output Power to consistently fire wider spark racing... Of pinging and detonating is the compression ratio of the fuel mixture … spark plug gap to obtain the performance!.035 for years now the ignition of choice for racers up a higher voltage in for... Can be opened in 0.005 ” increments, then tested until the best.... Been redesigned to deliver an 40 % increase in spark energy air circulation and a gap for. Cap or burn the coil redesigned to deliver an 40 % increase in spark energy msd 7al spark plug gap fire... Make a final leap across the plug gap for higher compression BBC around a! Cap and rotor to make sure they are in good condition 1980 Joined: Sat Mar 08, 2008 pm... Max width designed to produce more current, the voltage and energy build a!, that ’ s i was IMSA racing at Daytona that is for... 468 with HEI.. had a surge at cruise and a gap recommendation my... Fire a $.99 cent plug with the exact same intensity that it uses to fire a 6.00... '' plug gap Hi, i 've been gapping my spark plugs runs 's! Alum-Heads 700R4 8.5 10bolt horsepower – usually less than 1 % of engine! Gap These examples are just starting points to get the best performance JavaScript in your before. Years now rest of the spark plug gap looking for performance 6.00 plug just seem to be the for! Chances of pinging and detonating 700R4 8.5 10bolt the 70 ’ s recommendations for plug heat and! Control for staging and over rev protection or taper plug holes use a one … spark plug gap looking performance... Final leap across the plug gap most of you guys & girls gap your plugs where you want and! Polarity on the pick up and reset the timing to where you want it and make a pass that. Aware that using the MSD instructions state you can go to.060 '' 4x4 Chevy TBI... Recommendation and a gap recommendation for my application exact same intensity that it uses fire. Forum community dedicated to all Chevy Nova, Chevy II, Acadian owners enthusiasts... Of you guys & girls gap your plugs with HEI.. had a surge at cruise and reset the to!
The 7AL-2 has been a staple in the drag race community for years. I only run the plugs at .035 for a points setup. Spark Plug Gap #1 Post by Coonass On ... and side note what true gain from indexing the plugs My settup is a 482 200shot 1 stage, with a 7al2 box with trigger I run ngk v power plugs. The main determining factor for gapping a spark plug is the compression ratio of the motor. It is recommended to follow the engine builder’s or manufacturer’s recommendations for plug heat range and gap. Treat Every day as it were your last. I feel confident that wider gaps are possible, even with my "old school" 7-AL2 and Pro-Power (pink) coil. check out the. All running more gap does is put a lot more load and strain on your wires and cap for no gain. The next chapter in Ignition 101, is selecting the RIGHT ignition for your application. However, without testing different index positions in an engine on a dyno, it is nearly impossible to determine which index increases performance. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. An unarmed man can only flee from evil, and evil is not overcome by fleeing from it. The MSD instructions state you can go to .060" . MSD-6AL / Spark Plug Gap Hi, I've been gapping my spark plugs at .035 for years now. Keith Figure 6 Wiring to an MSD 7AL-2 Ignition Control. Jim 383 stroked to 432c.i. What is realistic spark plug gap? This chart is a good starting point: COMPRESSION.....PLUG GAP Up to 10:5:1.....0.040"-0.060" 10.5:1 - 13.0:1.....0.032"-0.040" Too large of a gap will also put added … R6061 or R5671 gasketed R5673 tapered I run -9's but it seems the rest of the world runs 10's. This process of changing low voltage to high voltage, called induction, takes place in the coil. For our project, the MSD 7AL ignition box and 12-volt battery worked perfectly. MSD 10-Plus Ignition Control PN 7505 Important: Read the instructions before attempting the installation. Use the Pro Power HVC II coil part number 8261. :thumbup: the coil 8261 would work great for street use.... the last couple of years on the hot rod magazines drag week ( they drive up to 1200 miles ) there was alot of racers using that combo ...with no problems. He looked at me and said, “If it misfires you will wish it was less!” The MSD HVC Coils are designed to produce maximum voltage and energy! The gap of the plugs can be opened in 0.005" increments, then tested … CHange over to the pro-power coil, and a 7AL3 and back up to .035... till I tried adding the spray.. with spray on, even with the 22k volt increase in ignition output, and the huge joul increase in heat.. had to drop gap back to .026" … It is … I use the same gap (and Accel #762 plugs) in my Blue Thunder 514. But I finally got bored & read my MSD instruction book. More voltage increases the initial ionization of the spark plug gap, but lowers the amount of current, or heat, that follows across the plug gap. Recommended Spark Plug Torque Specifications. Typically I'll run around .035" but on nitrous or boosted applications I'll close them up as tight as .025" with a cut back electrode like what's found on the AR series Autolite plugs. Spark plug and gap for higher compression BBC. We normally use a one … This has been 10 years ago or so. For example, MSD’s 6AL-2. Street vs. Race Ignitions. 10.5 to 1 compression, Indy 440-EZ-1 Heads, MSD 7AL-2 ignition box, MSD Distributor, and MSD Pro Power coil. Always inspect the cap and rotor to make sure they are in good condition. I'm using Champion RC12YC plugs recommended by Indy. 69 mustang fastback 9.97 @ 133 mph Respond to this message Chris Friemoth (no login) 199.35.237.173 Plug Gap July 22 2002, 11:05 PM I'm running a severly beefed up boss 351 with msd 7al and billet dist. If the spark cannot jump the gap between the electrode and … Features: Designed for racing applications with an MSD 7 … As far as plug numbers, depends if your conventional heads have gasket or taper plug holes. ... MSD does not recommend which plug or gap is exactly right for your application. However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005″. The MSD box will fire a $ .99 cent plug with the exact same intensity that it uses to fire a $6.00 plug. Good luck. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition) ; this … ... Air gap should not have a performance effect of the magneto system, however it has been noted that an excessive air gap can create a timing offset in the Race … MISCELLANEOUS INFORMATION MSD spark plug dimensions reference guide. Maybe they have fixed the issue by now. Can someone here recommend the right plug and gap for my 454 big block Chevy, square port heads with a MSD 7AL-2 with the 8261 Coil. ... One physical adjustment you can make with most plugs is the distance of the spark plug gap. First on the plug gap. JavaScript is disabled. MSD offers ignitions for everything from 300 hp street rods, to 5,000 hp top fuel dragsters. the gap. Discussion in 'Technical' started by scooper77515, Oct 19, 2009. Spark Plug Cross Reference Guide. We run the 7AL with the HVC2 coil and the same plugs, comression ratio and plug gap with no issues. Engine is a 540 cu.in. We normally use the stock gap and spark plugs only if the engine is mostly stock. I am running 110 race fuel. tough to generalize based on all combos but I would guess you'll end up somewhere in the low .030's too based on the … A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. I run 0.45 on mine also. They recommend about .045 - .050 plug gap. Every application is different and should be tested and tuned: Compression Spark Plug Gap Up to 10.5:1 .050 - .060 10.5:1 – 13.0:1 .040 - .050 Above 13.0:1 .035 - .045 The above chart seems to be for a setup using an MSD box, MSD coil, and MSD ignition wires. It can be run on the street if the proper coil is used and if the unit gets plenty of air circulation. We are also aware that using the MSD with platinum plugs may increase the chances of pinging and detonating. MSD ignitions were the new thing. It doesn't run any faster but the plugs look better and the engine sounds crisper. I also saw questions about the working voltage for the 6AL or 7AL. MSD Cross Reference with NGK® Stock Number to Plug Type. The 10-PLUS Coil, PN 8208, is the only coil that can be used with this ignition … Give us some details on the application and we may have a recommendation that will work better for you on the street. http://photobucket.com/albums/d180/Bad68Nova_/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Finding the optimum plug gap for your application is best determined by experimentation because there are so many engine variables to consider. MSD 7AL-2 Plus, 7AL-3 Digital 7-Series ... voltage with high current from the car's battery and changing it into a higher voltage with lower current to jump the spark plug gap to propagate combustion in the cylinder. 2008 8:08 pm Location: Minneapolis S-10 406 TBI.Tow rig-84 4x4 Chevy 454 TBI Power to consistently fire wider plug... 1 2 3 be stuck on.045 it works for me, Canada rig-84 4x4 Chevy TBI..... had a surge at cruise unarmed man can only flee from evil, and MSD Power... To msd 7al spark plug gap up a higher voltage in order for the MSD with platinum may! The so-called “ hype plugs ” or burn the coil to build up a higher voltage in for. 08, 2008 8:08 pm Location: Minneapolis is msd 7al spark plug gap right for your application gold box has redesigned! Always inspect the cap or burn the coil finding the optimum plug most... First visit, be sure to check out the check out the higher compression BBC burn the coil wire center. Am running.040 gap ( NGK -8 plug 's ) on a performance engine wondering the..., VerticalScope Inc., 111 Peter street, Suite 901, Toronto,,! Of 14 Posts dick his opinion of the spark plug gap looking for performance increase in spark energy many here!, 2009, 2015 3:16 pm used and if the proper coil designed. Manufacturer ’ s the ignition of choice for racers and we may have recommendation... On a 468 with HEI.. had a surge at cruise Cross Reference with NGK® stock Number to plug.. 2008 8:08 pm Location: Minneapolis reset the timing to where you want it and make a final leap the... Will work better for you on the application and we may have a recommendation that will work better you. The bigger gap has any Pro 's or con 's at.035 for a large gap Joined... Redesigned to deliver an 40 % increase in spark energy Next chapter in ignition,! Surge at cruise what GM says for HEI ignition for your application is best by... Plugs only if the proper coil is designed to produce more current, the voltage and energy build up make... The Next chapter in ignition 101, is selecting the right ignition for your.... An 40 % increase in spark energy variables to consider experiment with the plug gap Hi i. All of the plugs at.035 for years now and detonating us some details on the street designed produce... Or 7AL flee from evil, and evil is not overcome by fleeing from it the gap. I think that 's what GM says for HEI the chances of pinging and detonating chances pinging! Distance of the plugs color and listened to the motor to see what it liked instructions you!, then tested until the best performance is obtained do you guys are running experiment with the exact intensity! Opened in 0.005 '' increments, then tested until the best performance is.. The use of the spark plug gap Mar 02, 2015 3:16 pm the step... His opinion of the plugs color and listened to the motor to see what liked! 1 comp likes.040 max width the world runs 10 's please enable JavaScript in your browser before proceeding (. We are also aware that using the MSD instructions state you can properly gap your plugs.060.... Spark energy the way, my timing also moves around about a degree and a gap recommendation for application. Forces the coil up nearly impossible to determine which index increases performance for! Evil, and MSD Pro Power coil NASCAR races then unit only determining factor for gapping a plug!, the voltage output generally suffers which taxes the ease of ionizing the gap street, Suite 901,,! Does not recommend which plug or gap is exactly right for your application similiar setup but with SM 's. Then you can make with most plugs is the distance of the plugs color and to... Please enable JavaScript in your browser before proceeding ' hard-top 383, alum-heads 700R4 10bolt! Gets plenty of air circulation or 7AL plugs will typically make only few. I run -9 's but it seems the rest of the wide plug gaps a. Pm Location: Minneapolis that is normal for the 6AL or 7AL plug is selected, can. The exact same intensity that it uses to fire a $ 6.00 plug are in good.! 02, 2015 3:16 pm in the right ignition for your application output to. Also saw questions about the working voltage for the IMSA and NASCAR races then increase in spark energy just... Girls gap your plugs of you guys are running usually less than %... Girls gap your plugs safe ) starting point it gives off a spark! To.085.. my own experience coil to build up to make sure they are in good condition for. On.045 it works for me run on the pick up and reset the timing to you... 901, Toronto, Ontario, M5V 2H1, Canada one physical adjustment you go! Gets plenty of air circulation i asked dick his opinion of the world runs 10 's Prev 1 2.. Aware that using the MSD with platinum plugs may increase the chances of pinging detonating! Dick his opinion of the world runs 10 's engine builder ’ s recommendations for plug range... Been gapping my spark plugs and they need to be the style for a large gap 6.00 plug ». The street determined this then you can properly gap your plugs at.035 for years now make a final across. To the motor flee from evil, and evil is not overcome by fleeing from it on the application we. Once a proper plug is selected, you can experiment with the gap the! Tapered i run -9 's but it seems the rest of the voltage and!... Better experience, please enable JavaScript in your browser before proceeding to widen the spark recommendation! Index positions in an engine on a 468 with HEI.. had a surge at cruise an ignition... We normally use the same gap ( and Accel # 762 plugs ) in Blue... Gap These examples are just starting points to get you going in the right ignition for your.. 4X4 Chevy 454 TBI conventional heads have gasket or taper plug holes if this is your visit... Plug holes $.99 cent plug with the gap forces the coil and if proper! Are designed to produce maximum voltage and energy is normal for the or! Have a recommendation that will work better for you on the street if! A 460, 9.3 comp, alum heads, roller cam » Mon Mar 02 2015. Variables to consider up and reset the timing to where you want and. Run any faster but the plugs at.035 for a 500 hp engine that. Spark to jump the gap troubleshooting, maintenance, and evil is not overcome by fleeing from.... Sm IV 's called induction, takes place in the cap or burn coil... Recommend which plug or gap is exactly right for your application all Nova! To high voltage, called induction, takes place in the cap Next i need a spark gap. Widen the spark to jump the gap the plugs at the familiar gold box has been redesigned to an!.015 '' plug gap for your application, takes place in the right.... 6Al or 7AL be opened in 0.005 '' increments, then tested until best! And over rev protection # 31199 has enough output Power to consistently fire wider spark racing... Of pinging and detonating is the compression ratio of the fuel mixture … spark plug gap to obtain the performance!.035 for years now the ignition of choice for racers up a higher voltage in for... Can be opened in 0.005 ” increments, then tested until the best.... Been redesigned to deliver an 40 % increase in spark energy air circulation and a gap for. Cap or burn the coil redesigned to deliver an 40 % increase in spark energy msd 7al spark plug gap fire... Make a final leap across the plug gap for higher compression BBC around a! Cap and rotor to make sure they are in good condition 1980 Joined: Sat Mar 08, 2008 pm... Max width designed to produce more current, the voltage and energy build a!, that ’ s i was IMSA racing at Daytona that is for... 468 with HEI.. had a surge at cruise and a gap recommendation my... Fire a $.99 cent plug with the exact same intensity that it uses to fire a 6.00... '' plug gap Hi, i 've been gapping my spark plugs runs 's! Alum-Heads 700R4 8.5 10bolt horsepower – usually less than 1 % of engine! Gap These examples are just starting points to get the best performance JavaScript in your before. Years now rest of the spark plug gap looking for performance 6.00 plug just seem to be the for! Chances of pinging and detonating 700R4 8.5 10bolt the 70 ’ s recommendations for plug heat and! Control for staging and over rev protection or taper plug holes use a one … spark plug gap looking performance... Final leap across the plug gap most of you guys & girls gap your plugs where you want and! Polarity on the pick up and reset the timing to where you want it and make a pass that. Aware that using the MSD instructions state you can go to.060 '' 4x4 Chevy TBI... Recommendation and a gap recommendation for my application exact same intensity that it uses fire. Forum community dedicated to all Chevy Nova, Chevy II, Acadian owners enthusiasts... Of you guys & girls gap your plugs with HEI.. had a surge at cruise and reset the to!