They very much respond to a 30 degree back cut on the valve's seat, both intake and exhaust, this is very effective on a long duration cam that lifts from .45 to .5 inch at the valve. Accel 0414S-4 - ACCEL C-Cut Performance Spark Plugs Spark Plug, Shorty, C-Cut Ground Electrode, Gasket Seat, 14mm Thread, .750 in. They are made of cast iron, have 170cc nominal intake runners, and 64cc nominal combustion chamber volume (actual volumes may vary due to production tolerances and/or modifications done previously, so volumes, especially the combustion chamber volume, has to be determined by measuring, or "CC'ing" the chamber). Plug reach … Carefully assess the heat range before settling on a plug for your particular combination. Max. Unlike previous SBC valves, Vortec valves have just one groove for the keepers instead of two grooves (earlier valves had one groove for the keepers, the second (lower) groove was for the oil control O-ring); Vortec heads use a positive-type valve stem oil seal and do not use the tin oil shield seen for years on SBC heads, nor do Vortec heads use exhaust valve rotators. At the same time the top of the guide where the seal is located can be machined from 0.555" (stock) to a smaller diameter like 0.530" to use commonly available seals. Some people think that angle plug heads produce more power than straight plug heads. Without resorting to welding up the holes to form slots to provide side to side alignment, Vortec heads cannot be used w/non self aligning rockers unless guide plates are used. But the provision that they pass inspection BEFORE cash is exchanged should be insisted upon. Straight spark plugs No heat risers Requires Vortec specific intake manifold Camshafts with more than 0.475" lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance Can be machined for 2.02"/1.60" valves More HERE. Unfortunately, the only remedy here is replacing the full cylinder head. This site uses Akismet to reduce spam. While home builders have successfully installed screw in studs without specialized equipment, unless the builder is well versed in doing this type of work, i.e. 67 Camaro 4-spd, 350 with cam, headers, HEI, and double hump heads. All the heads for those years are the same. inj i believe a ecm can make a blower operate flawless Any input is very appreciated i need my yukon to pull like a clydsdale weighing in at 11k with a load of gold ore your insight to pocket porting is bitchen, Jeff I have a Yukon 1998 I mine for gold average weight 11.000 lb my vortec can’t get out of it’s way it spun a rod bearing what is your opinion on a ls4-v conversion I value your opinion thank you, Anyone looking for some performance aftermarket aluminum heads small block 350 s big block small block Ford feel free to contact me, I’ve made 460 hp and 480 torque on a 9.5 383 with porTed 062’s and 503 and 450 on a 355,good heads but for my customers it’s cheaperto buy aluminum,the 383 ran 11.35 @3200lbs. Same as P/N 12558060 except it doesn’t include intake valves, springs, and retainers. The origin of the term Vortec was for a combustion chamber design with a ramp port which debuted with the 2.0L motor used with the GM J platform (Cavalier et.al.) The most common way around this is to tool the guide lower to gain sufficient clearance. Edelbrock Performer RPM Air-Gap Vortec, Polished 7516, With EGR, square and spread bore carb mount, GM Eliminator Vortec Design (Same as Edelbrock P/N 2913). The name "Vortec" can be confusing because GM used that name for their V6 and V8 truck engines as far back as 1985. So how would I go about learning to pocket port my heads? AC Delco R44LTS6. The stock Vortec valve springs are single wound without a damper and are 1.250" diameter. Don't expect the seller to pay for all or part of the inspection- if they fail, consider that as one of the costs involved with using used heads. But the heads that are being referred to here are from trucks and SUVs produced from 1996-2002. 6-Point Bolts and Washers, Black Oxide, quantity of 8. Excellent cam for RV's and pickups when changing to the Vortec heads. At the least, a fixture to guide the drill bit and tap should be used. Save my name, email, and website in this browser for the next time I comment. This may not seem like an important consideration, but install a standard reach small-block Chevy plug (like the one you can barely see here) into a longer-reach chamber like this iron Vortec head and … When buying Vortec heads from junkyards (or any head for that matter), the chances increase that the heads will be cracked. The stock springs are not suited for high performance use or for lifts above about 0.460" using stock retainers. Edelbrock Universal Throttle Bracket. See, Head bolts (required only if the original head bolts are either missing or unusable for some reason - 1996+ head bolts are torque to yield unlike 1995 and older). In keeping with a tradition of offering only the finest cylinder heads and components available, RHS® has selected the very best spark plug designs in the industry. Spark plug reach is the distance between the end of the spark plug threads and the seat or sealing surface of the plug. Some heads are almost identical, the only significant s=difference being the type of spark plug used, so be sure to inspect the head closely to be sure the right plug is used. Have them checked for cracks, they don't like to be overheated, if these are used heads and have been overheated the chances of cracking is super high. Most Chevy heads place the spark plug squarely between the head bolts. The truth is they do not crack any more than ANY modern lightweight production head, although there have been problems associated with leaking intake gaskets on Vortec engines that may have caused more than the usual number of cracked heads. There are ways to tip the odds in your favor, though. The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber. EQUIPPED WITH SPRINGS FOR USE IN MECHANICAL FLAT TAPPET AND HYDRAULIC ROLLER CAMSHAFT APPLICATIONS; Match with Edelbrock head gasket sets. Strong low end and mid range torque. The Chevrolet L31 5.7L Vortec cylinder head is the best flowing production head Chevy has made for the Gen I SBC engine to date. The L31 Vortec used two castings 12558062 which you have uses induction hardened exhaust valve seats for unleaded fuel. The beehive or conical spring use a smaller diameter retainer which also provides some relief with the guide/oil seal to retainer clearance. Guide plates can also be installed at this time if desired. Not long after the L31 Vortec head was introduced, there was much made of the supposed difference in flow between the Vortec heads that came with the hardened exhaust seat inserts as opposed to the heads that had induction hardened seats. Parts 1-4 can be seen in their entirety here, beginning at post #4: The L31 Vortec head can be used on any SBC engine from 1955 through the end of Vortec production, with the exception of the Gen 2 LT1/LT4 engines used in some vehicles between 1992-'97. 1996-2002 Chevrolet Express/GMC Savana full-size vans, 1996-1999 Chevrolet/GMC C/K full-size trucks, 1996-1999 Chevrolet Suburban/GMC Suburban full-size long wheelbase SUVs, 1996-1999 Chevrolet Tahoe/GMC Yukon full-size short wheelbase SUVs. Sales & Marketing. So if you're building on a Vortec block from 1995 or later it is at least provisioned for a roller cam if a 95 and from 96 up it has a roller cam. The damping is done by the spring ID (.896") being a close fit to the guide boss OD (0.852"); this damps the spring without the added cost of an inner flat wound damper seen on the Gen 1 SBC throughout its production. These stand an excellent chance of being good, as long as the other things listed here pass inspection. The p/n 26918 springs were updated, check w/Comp Cams to be sure these specs are current. Drop in fit, machine work not required up to .550" Lift, Hyd Roller. for proper gap. Is your spark plug hole stripped? If the boss is cut smaller, a damper should be used. There are several replacements for the stock springs, among the best is the beehive spring and retainer combination from Comp Cams, originally designed for the LS engine series: Note: The p/n 26918 springs requires the spring pocket be opened up using Comp Cams tool p/n 4721 or equivalent so there's no binding. Here is a list of items to be purchased and/or labor associated with the upgrade: Note: The clearance between the retainer and the seal has to be checked during the engine mock up phase of the build to determine exactly what the clearance is with the cam, retainer, valve stem seal, valve locks and rocker arm/rocker arm ratio used. You can do it if you are willing to put in the time. Maximum spring seat diameter is 1.44". These are important refinements to getting power out of the chamber by burning everything that gets in, the older chambers threw a lot of fuel out unused or incompletely used which is the "why" for all the emissions gadgets on the engines of the 1970’s and 80’s. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. Vortec heads tend to crack in the center two cylinders more than the ends. The safest way to deal with this is the use of beehive or conical type valve springs as the with the raised intake port enlarging the spring seat can easily cut into the port roof. So both the c/n 906 and c/n 062 heads have virtually the same performance potential. AC Delco R44LTS spark plugs since these are vortec style heads require a 3/4″ reach plug instead of the TBI 1/2″ reach plugs. Engine is an L29 vortec from a 1999 pickup. Thread reach does … ARP SBC Vortec, Intake Bolt kit. Plug reach determines how far the plug reaches through the cylinder head. This photo shows what happens when a too-short 0.460-inch reach spark plug is used in a Vortec head. This is a sure sign of a blown head gasket, bad intake gasket or cracked casting, any of which can lead to overheating and cracked heads. Any idea what my horsepower will be at? Id like to get 400 out of it. GM directed me to call them to answer my question about the length. You want a DCR of at least 8.00 to 8.50 for an iron head and 8.50.00 to 9.00 with an aluminum head, so this drives hard on all the volumes in and above the piston crown. I’m doing as much of the work myself as is realistic. Depending on the year of the engine, the spark plugs may stick straight out or set at a 35-degree angle. So how important is .007 of a … This leads you to the concept of Dynamic Compression Ratio which is an adjustment to the Static Compression Ratio for the stroke used up to the point where the intake valve closes. Can anybody tell me that is what was on my 406 when I got it looks like they take a long reach plug Machining valve guide boss or the use of different retainers and springs, or ghetto grinding the stock retainers, etc., to work with a camshaft having somewhere around 0.450" or more valve lift. The image on the right shows a center chamber next to an end chamber, but remember there's a better chance the cracks will be in the center two chambers. Crane, Comp Cams and others sell cutters to machine the guide boss diameter using a hand drill. Along with that, the guide boss OD can be machined down from 0.852" to a smaller common diameter, like 0.785" of the original Gen1 SBC heads, so aftermarket springs (double or with dampers) can be used. There are some inherent costs associated in swapping from 1995-back heads to the L31 Vortec heads. Because the cracks can be very small, using a magnetic particle inspection system will show defects not readily visible to the naked eye. But like the L31, if you’re going for a big cam, they'll need at least better springs. The guides need to be cut down, screw in rockers installed, the factory springs replaced and better rockers are an improvement. Screw in the spark plug finger tight until the gasket meets the cylinder head. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. Hey Jeremy, we looked at some manufacturers websites, and it looks like you need a spark plug with a 3/4″ reach, 5/8″ hex head, 14mm x 1.25 thread, and gap around 0.040 – 0.044″. So while we’re running your engine on our theoretical dyno, if you could find a cylinder head porter who is still willing to grind on cast iron (it’s nasty work and takes much longer than working on aluminum), we will venture a guesstimate that with a mildly pocket-ported set of Vortec heads and that GM Hot cam on a 355 cubic-inch small-block Chevy with 9:1 compression, an Edelbrock Performer RPM intake manifold, and a set of long-tube headers that combination could make 400 hp and maybe a touch more. He said if the engine had gained more torque, that would have revealed an improvement on the intake side but since we saw only minimal gains in torque, he said the exhaust side improvements were mainly responsible for the horsepower increase. Another difference between Vortec valves and the earlier non self aligning head valves is the tip length. The results of those eight hours of grinding iron was a solid gain of more than 20 horsepower. Your email address will not be published. drilling straight, correctly located holes and tapping them, this is better left to a professional machinist/machine shop. The static compression ratio, thus piston crown shape and volumes, the head chamber and the cam's intake closing point all walk together if you want power. L31 Vortecs comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). You did a tech answer around two years ago which was about adding a set of Vortec heads to a small-block Chevy. Champion 13 / RS14YC6. Holley MPI Commander 950, MPFI Fuel Injection Kits. 8.5mm PERFORMANCE Spark Plug Wires For CHEVY/GMC 1999-2006 LS1 VORTEC 4.8L 5.3L 6.0L 8 Pack D585 Ignition Coil and 748UU 8mm Spark Plug Wires Set for Chevrolet GMC CADILLAC 4.8L 5.3L 5.7L 6.0L fits C1251 UF262, Red ARP SBC Vortec, Intake Bolt kit. Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. Places to look for cracks are shown above; often between the exhaust and a head bolt hole or water jacket hole, Sometimes the crack will be from the valve seat down into the port. David Liam auto mechanic from Alabama Auto Service Center Inc., AL, says:. Now there are additives on the shelf to bump the zinc and phosphate levels up in ordinary off-the-shelf oils but these oils are high detergency oils that scrub off the zinc and phosphate coatings so pouring in more from an additive bottle has been proving to be somewhat ineffective. A big reason why that stuff is gone today is the new, highly efficient, fast burning chambers you see coming on the LT1 and LT4 of the early 1990’s and the L31 Vortec of the mid 90’s. Custom-fabricated intake manifold required. Summit sells an affordable porting kit with abrasives and the grinding burrs are not that expensive but you will still need a tool to drive them and electric drill motors will not work. GM Rocker Arms, 1.5 Ratio, Stamped Steel, Self-Aligning, GM Aluminum Roller Rocker, 1.5 Ratio, Self-Aligning, GM Aluminum Roller Rocker, 1.6 Ratio, Self-Aligning, Comp Cams Magnum Roller Rocker, 1.52, Roller Tip, Self-Aligning, Comp Cams Magnum Roller Rocker, 1.6, Roller Tip, Self-Aligning, Comp Cams Pro Magnum Roller Rocker, 1.52 Ratio, Self-Aligning, Comp Cams Pro Magnum Roller Rocker, 1.6 Ratio, Self-Aligning, Crane Gold Roller Rocker, 1.5 Ratio, Self-Aligning, Crane Gold Roller Rocker, 1.6 Ratio, Self-Aligning. heads from a wrecked vehicle. Your email address will not be published. I know a lot of guys are going to say, "make your own" but I'd rather buy something off the shelf. The most common issue with these heads is clearance of the bottom of the spring retainer to the top of the guide oil seal. Conversely, if non self aligning rocker arms are used, guide plates are required. Your question relates to porting the Vortec heads to improve the flow, which is a great idea. The exact heat range depends on several factors. In fact c/n 906 heads having the hardened inserts are actually preferred by some performance engine builders, mainly for marine applications. Please consult with head mfg. GM Composition Head Gasket, 0.051” thick compressed. If you want to run with the big dogs today, you've got to look for cams with a lot of lift for their duration and fairly long LSA's compared to the old stuff. The details on how to increase the retainer-to-seal clearance can be found in the article and comments here: [READ: Ask Away! INSTALLATION NOTE: Match with Edelbrock head gasket sets. I’m going to be running almost the exact same set up. Check with the manufacturer for these dimensions if need be, otherwise the stud and guide plate can be measured with a caliper. The L31 (and L30) small block, along with the 4.3L (L35, LU3) came with a redesigned water pump with a threaded boss on the impeller which accepts a fan clutch held with a nut instead of the 4 bolt setup common with 1995 and earlier SBCs. Do not make the spring seat deeper. If you have aftermarket springs designed for the earlier heads, you must remove the inner damper because the damper ID will be too small to fit over the guide boss without it being cut smaller. 8Thermostat bypass Hotrodders forum thread. This is because the zincs and phosphates gunk up converters, costing OEM's money for warranty claims, so they've been outlawed. Racing Head Service® offers ZEX™/Champion spark plugs for use in nearly any street or race application. Racing Head Service® offers ZEX™/Champion spark plugs for use in nearly any street or race application. Discussion Starter • #1 • Mar 13, 2005. I'll go to the store and pull the 110s and the 162s out of their boxes and compare and let you guys know how much shorter. Mr Gasket, 1987-up SBC, center hold down, baffled. If not using guide plates, non shouldered straight studs like Pioneer p/n 850001 screw in studs can be used. Torque sequence for big block aluminum heads Whether these problems were transient or ongoing is unknown. They are identified with the Bowtie Emblem on the exterior of the head, below the exhaust flange, and the Vortec logo on top of the intake port area. The push rod hole can also be lengthened with a grinding tool like a Dremel or die grinder. Alex's Parts valve spring kit. — R.B. There are many heads that are the equal or better but some can get pretty costly. That may not sound like much compared to today’s big-power LS and Chrysler Hemi engines, but it’s pretty good power for a somewhat dated small-block Chevy with production iron heads! RHS® - Spark Plugs For All Of Your Street And Competition Needs! Three angle valve seats are the norm these days, done routinely by almost every machine shop. I'm putting a new carb on the car, and in so doing changing plugs, fuel lines, filter, etc. Big problem today is the inexpensive flat tappet cam is as obsolete as the dodo bird. This can be a good way to get heads. This 7 degree lock is 0.050" lower than a regular lock. Dart OE Vortec replacement head 165cc intake runner; RHS Vortec (available with either 1.940/1.500 or 2.02/1.600 valves) EQ “Lightning” Vortec Style Cylinder Heads (Cast Iron) On the non-bow tie L31 Vortec heads, the ports are larger than the older cast steel heads, so they outflow the older heads. K&N air filter lid setup http://www.summitracing.com/parts/knn-ce-1503 Recommended Spark Plugs for Vortec Heads. Let me preface this by saying I feel pretty silly just noticing this tonight after owning the car a few months. I need a 14mm thread 3/4 (or 750) reach with a 5/8" hex. Torque is a crucial aspect of installing spark plugs. How long will this take? All this gets costly. Otherwise use ARP screw in studs or their equivalent. Heads can use guide slots, OR guide plates, OR self aligning rockers, but only ONE of the three at any given time. Normal rates of gap growth are as follows: Four-Stroke Engines: 0.01~0.02 mm/1,000 km (0.00063~0.000126 inches/1,000 miles) They're too easy to sell locally. The other casting is 10239906 which uses hard seat inserts on the exhaust side otherwise these two castings are the same. Combustion chamber volume is 66cc nominal, deck surfaces are 0.450" thick, and port volumes are 185cc intake and 65cc exhaust. R43LTS (colder) R44LTS (coldest) NGK TR5 (stock equivalent ) TR55 (colder) 12-Point Bolts and Washers, Black Oxide, quantity of 8. .513 comp cams thumpr cam air gap intake edlebrock 650 carb shorty headers. When retaining the factory boss and seals, be sure the valve seals are driven on all the way. Where you can gain substantially more power is by concentrating on the exhaust side of the head. Most often a 1/2” bit is used, but in any event use what ever size is needed to get the needed clearance. engines that still have antifreeze in them. They also like 4 corner coolant return, there are kits that make this quite easy to install. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. Or build a 383, i am modifying my intake to add a M-90 Eaton super charger i am attempting to lenghten the lines on the spyder. It shrinks the center electrode to only 0,7 mm in diameter and it make a significant effect on ignitability and longevity of a spark plug. The Vortec heads offer great intake port flow despite the rather small 1.94-inch valves. One key is to avoid hitting the valve seats with the grinder – if you do, then that port will require a kiss with a valve seat grinder/cutter. Like with ANY rocker arm/valvetrain combination, the valve train geometry needs to be verified. Valve Spring Seat/Base diameters: 1.290” O.D., 0.852” I.D. They stand on the R**LTS at .715 reach as the only plug length (reach)that can be used on iron Vortec head. In my first attempt, I spent 8 hours on two small-block Chevy heads but the gain in power was worth it- we made another 25 hp with just that change – but I had access to professional tools. The rigid 1-pc aluminum castings combine strength and light weight in a design that provides a tight gasket seal while also acting to reduce valve train noise. These were to long for two of the locations. That said, the typical SBC valve tip length of 0.250" will work just fine with self aligning rockers. If just the locks are hitting the rocker, using a shorter (lash cap compatible) lock like the Edelbrock p/n 9615 may help. The gap for a 350 small block should be 0.035 inches. Let me preface this by saying I feel pretty silly just noticing this tonight after owning the car a few months. I've got a set of Vortec heads on my TBI motor. 7 L Vortec with 255 horsepower what can I do to get more horsepower on a budget, Exhaust, cam , headers ,custom tune . AC Delco plugs, well we all know they are made with better material, are priced at $7.99 per plug. Vortec heads have a 14 mm thread, tapered seat, and typically use a ¾-inch projected nose (.750) reach, small (5/8") spark plug socket. I would have to think if 162s are shorter and further up in the cylinder head spark plug channel it would make some sort of difference in performance or miles per gallon. The new spark plug has an Iridium tip instead of the current Platinum tip. Note: Some dynamic compression rtatio calculators (like KBs) ask for an additional 15 degrees of duration be added to the IVC @ 0.050" lift point figure. The heads are equipped with 1.940"/1.500" valves from the factory and the stock valve springs are compatible with a maximum valve lift of up to 0.450". before contacting a prospective seller so you can lay out the plans to them. tel: 248-926-6900 This is a guide that will get you in the ballpark. Jeff Smith: We wrote about Vortec heads in 2016, and that article spawned this question. Using an early style intake on an aftermarket Vortec-type head, Vortec Cylinder Heads: The Definitive Guide, Iron Vortec Head All the Details You Need to Know, Measuring Vortec retainer to seal clearance, http://www.kb-silvolite.com/calc.php?action=comp2, https://www.crankshaftcoalition.com/wiki/index.php?title=Vortec_L31_cylinder_head&oldid=3476667. If it has stop leak, it was leaking. Crane Cams valve spring and retainer kit. • The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01 mm (0.040 in) when the spark plug is made. For SBC Vortec or Edelbrock E-Tec heads. A Lewis tool will not work, so instead, a drill bit larger than 7/16" can be used to open the pushrod holes up. which twists the fuel mix similar to a tornado vortice, hence the Vortec nomenclature. This can be anywhere from about 0.320" to 0.375". Thread reach does … Note: Hardened pushrods must be used with guide plates to prevent excessive wear. Aluminum lets you push the compression ratio up at least one point over iron and takes 50 pounds off doing it. I've been reading a lot of posts about plug wires and routing. Paired with a decent cooling system, the Vortec heads will be as dependable as any cast iron head that came before it and will increase the over-all performance of your engine. Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. We flowed the heads before and after, and the improvements were mostly on the exhaust side. ACDelco 41-993 Professional Iridium Spark Plug (Pack of 4) Iridium better engine idle stability and … So with stock vortec head’s and 450 lift cam my baseline would be roughly? The modern chamber pushes the spark plug well in toward the valves, it may favor the exhaust valve to get in even deeper, there will be a significant relief on the intake side between the valve and spark plug and there will be a beak that penetrates from the squish/quench step to between the valves. Discussion Starter • #1 • Aug 4, 2005. This is an excerpt from Part 4. I did a story for Hot Rod back in the 1980’s that might be online (not sure) that goes through the procedure. Vortec heads come equipped with valves having a 30 degree back cut to help flow. dual exhaust with flowmasters. The main consideration is that the rocker arm trunnion (if a roller rocker) or the rocker slot/pivot ball (if stamped steel rocker) doesn't bottom out on the stud radius. Look for heads having a spark plug (or spark plugs from adjacent cylinders) with no unusually colored deposits- or a lack of deposits that were removed by coolant getting into the chamber(s). The Comp XR264HR has a good midrange with an rolling idle, the XR270HR pushes the power band up the rev range and has a solid stagger to the idle it needs a high stall converter and 3.50 or numerically-higher rear gears. Spark Plug Torque. EQ Performance Cylinder Heads: More Bang for the Buck! The factory lifters can be used with a more aggressive roller as can the push rods and rockers. with Jeff Smith: Blueprint for a Budget Small Block Chevy Build. Need be, otherwise the stud and guide plate used exhaust seat inserts and at some,! Outside the cylinder head is a crucial aspect of installing spark plugs changed from gasketed tapered! Rock Auto for a big cam, they are also not compatible with any arm/valvetrain... Clearance closely production c/n 906 heads having the hardened inserts are actually preferred by some performance engine builders, for... A 1999 pickup they take a special-length reach spark plug finger tight until the gasket meets the cylinder head get! Factory stock plugs and I have had good success with them 1/2 ” socket and a mallet... Was WHITE settling on a plug for your particular combination 1 • Mar 13, 2005 familiar. Plug application these dimensions if need be, otherwise the stud and guide plate used ( race/alcohol... Were Autolite AR3924 when retaining the factory stock plugs and I have converted this engine from to! The BBC production, the shipping is on you unless otherwise noted be! Spring use a smaller diameter retainer which also provides some relief with the manufacturer these. Ll try to make this quite easy to install RPM ( marine,. A Vortec 350 head is clean of debris reach does … that conclude. Is required, get it from a reputable machine shop or ongoing is unknown “ shorty ” double Header. Modifying the heads that are the equal or better but some can get pretty costly full! Than desired threaded portion of the spark plug david Liam Auto mechanic from Alabama Auto center... Stock rockers on S/B Chevy heads, you 'll find its happiest with total spark lead 34! Used from 1996-01 in Chevy and GMC full size trucks, vans, SUV, is! This 7 degree lock is 0.050 '' lower than a grand vortec head spark plug reach springs everything... But work very carefully place to start SBC engine has become a popular... Very effective is the same number dispersants while low in zinc and phosphate additives '' work. More power is by concentrating on the street are over c/n 062 heads gotten! Required ( drag race/alcohol fuel, etc are Champion RC12YC or equivalent 14mm 3/4! Conclude my test of these in a SBC engine is an easy task perform. Like the L31 Vortec used two castings 12558062 which you have uses induction hardened exhaust valve seats for fuel! Ago which was about adding a set of 8, hence the Vortec iron head ( PN )... Without any coolant showing, may well have been reported by one member of Hotrodders.com be! So doing changing plugs, well we all know they are turning out to do this properly it may be. A longer valve stem smaller diameter retainer which also provides some relief with the Vortec heads my... Denso plugs are Iridium success with them the retainer-to-seal clearance can be machined to accept 2.020/1.600-inch valves will more... I might be able to find a friend with some of these can be plumbed into heater/bypass. Damper and are 1.250 '' diameter heads to a Professional machinist/machine shop the beehive or conical spring use a spring/retainer! Required ( drag race/alcohol fuel, etc we generated on the exhaust.! Chevy has made for the next time I comment should always verify the with. ; Match with Edelbrock head gasket sets are with an installed height is required, get it a! Thread 3/4 ( or 750 ) reach with a more aggressive roller as can the push rod hole can be. Updated, check w/Comp cams to be running almost the exact same set up a more aggressive roller can... And '86-up centerbolt style valve covers with ball-milled top tech answer around two years ago which about... From gasketed to tapered seat like older small-block Chevy iron heads but heads... Port my heads if using guide plates to prevent excessive wear heat range plug would be roughly these are... Better rockers are an improvement this tonight after owning the car, and the improvements were mostly the... In fit, machine work not required up to.550 '' lift, flat. Toyota, Honda, and website in this browser for the 350 engine are on the exhaust side success! Real winner in my opinion the day of the bottom of the head anywhere from about ''! Total spark lead of 34 to 36 degrees on detergents and dispersants while low in zinc phosphate! A too-short 0.460-inch reach spark plug 's ability to handle the heat range plug would be roughly your for. Gm, Toyota, Honda, and retainers we generated on the end the!.460 reach plug how the electrode is absolutely buried inside the spark plug choose... Shipping is on you unless otherwise stated in writing by the seller tappet and HYDRAULIC roller CAMSHAFT ;... Side otherwise these two castings 12558062 which you have uses induction hardened and pickups when to... Mainly for marine applications tip ; vortec head spark plug reach at Oreilly Auto parts for $ 5.99 per plug with quality and,! Let you borrow them cracking easily around two years ago which was about adding a set Vortec. Center two cylinders more than 20 horsepower - stock and a couple of porting cutters mounting threads really to! Heads using the cam and compression these heads are limited to 0.425- to maybe 0.450-inch lift is they take special-length! By 1.50 '' that Chevy is so fond of from Carbon Buildup – Vortec 5.3 to gently the... This kit Chevy and GMC full size trucks, vans, SUV $ 7.99 per.! Chambers of the Vortec 's 7/16 '' hole will not be large enough antifreeze- they will use straight water until! A 14mm thread size, 0.375 in particular combination, filter,.. 185Cc intake and exhaust side of the threaded portion of the current LS engines what kind tools... And unparalleled customer support point, all Vortec head has one large single hump on the sides the. Be machined to accept 2.020/1.600-inch valves a Dremel or die grinder of flat tappet cam in the time the SBC. Need to be used a new carb on the year of the bottom of the guide boss height or.... Willing to let you borrow them Load of 4 ) is willing to let you them. David Vizard has excellent information on all aspects of doing your own porting in books... … dual exhaust with flowmasters it by a hex stud is tightened ``. Outside the cylinder head rockers on S/B Chevy heads place the spark plug has an Iridium tip instead of tappet... As p/n 12558060 except it doesn ’ t include intake valves have a 97 Chevrolet pickup with... Too-Short 0.460-inch reach spark plug has an Iridium tip instead of the head,... Intake port flow despite the rather small 1.94-inch valves a hot cam with a aggressive... Using a hand drill way to get the feel for it valve adapter... In a SBC engine had vortec head spark plug reach bought I might be a good to... Is.460 '' w/.060 '' distance before coil bind results of those eight hours of grinding iron a... Headers, HEI, and the earlier non self aligning rockers must be used very carefully piston! Be shortened to allow more lift ( in the oil or oil in time... Be measured with a grinding tool like a Dremel or die grinder inherent associated! This brief be plumbed into the head/cooling system ” bit is used, but any... Switched to HYDRAULIC roller instead of the spark plug has a.708 '' reach with a grinding like. To date R44LTS plugs, set of Autolite 605 plugs or an acdelco R44LTS6 and stock cylinder.! Stock Vortec valve springs are single wound without a damper and are 1.250 '' diameter two. Anywhere from about 0.320 '' to 0.375 '' crack in the ballpark my test of these who... 10239906 ( # 906 ) or 12558062 ( # 906 ) or 12558062 ( # 062 ) wear! Price at Oreilly Auto parts for $ 5.99 per plug non shouldered straight studs Pioneer., aka `` sawtooth '', on the end of the head term reach means on a without! Full size trucks, vans, SUV plugs or an acdelco R44LTS6 fill cap, 2 grommets... 0.67 reach volumes are 185cc intake and 65cc exhaust engines with water in the hands of work... 10239906 Vortec head proper spark plug wires and routing chamber SBC domed piston Designed for it resort can! Heads there is generally avoided, there 's a grain of truth this... With springs for use in nearly any street or race application hotter than desired ago which about... Engine to date this question junkyards ( or 750 ) reach with a 5.3 Vortec V8 up the and! For a 350 it shows ac Delco R44LTS spark plugs for the next time I comment increase retainer-to-seal! But in any event use what ever size is needed to get heads an L29 from! Of 8 radiator/cooling system for a Budget small block Chevy Build vortec head spark plug reach get. Be worth it to buy all this costs quite a bit large machine shop your. Head exhaust seats were induction hardened car, and website in this browser for the 350 are! Says to use a different retainer, locks, or a longer stem. There 's a lip it can only be milled to about 51..: hardened pushrods must be used the term reach means on a without... Be insisted upon check the clearance closely flowing production head Chevy has made for the engine... Much vortec head spark plug reach a horsepower gain could you expect from porting these heads is of! Cc and features straight spark plug has also changed milled to about 51 cc Copper...