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Est. 2002
Jeep/AMC 4.0/4.2 "Lightweight" Roller Rocker Arm Kits(1.60/1.70, Fixed & Adjustable)
$540.00 - $670.00
If you want dyno proven hp & tq gains then here's one of the easiest ways to add 5hp/10ftlbs(1.60) or 10hp/15ftlbs(1.70). This is our next generation with even lighter weight, yet heavy duty, available in both 1.60 and 1.70 ratios fixed and "adjustable" roller rocker arm kits. These are 100% made in the USA and feature a heavy duty fully rollerized fulcrum and roller tip.
*3/8" .080" wall pushrods can only be used only on our competition heads unless you clearance your head accordingly. Possibly on fixed roller rocker arm kits and especially on adjustable kits you will have to space the valve cover up at least 1/2' for clearance from the added height of the over-sized rocker arms. We offer one of the best solutions for this issue with our 5/8" Billet Valve Cover Spacer Kit which is also listed on our site.
**Tech tip**
The factory rocker arm ratio is 1.60. Keep in mind when ordering your desired rocker arm kit that lift will be increased by going to a 1.70 ratio. Make sure your total lift value is not greater than your valve spring can handle(Coil bind).
Jeep/AMC 4.0 CNC Competition Cylinder Head(91-06)
$2,850.00
Sold out
Jeep/AMC 4.0 "CNC" aftermarket casting "Competition LS converted Cylinder heads". These heads are CNC'd then meticulously built from the ground up with all the upgrades and best parts such as: 2.02"/1.60" Stainless Steel 8mm valves, competition 5-angle valve job, fully hand ported and polished, beehive springs w/steel retainers and locks, upgraded Viton positive locking valve seals, custom machined spring seats for added cam lift capacity up to .600" lift, all fully assembled and ready to bolt on. We recommend this head for Strokers, Boosted applications, or 'Hot' upgraded 4.0/4.2 engines with upgraded cam, intake and header with increased rpm potential to reap the rewards.
***These heads depending on application and supporting mods will increase power levels from 25-75HP Naturally Aspirated and more with Forced Induction, with much added efficiency from the crack of the throttle to peak rpm. Your exhaust note and tone will change(Deeper/Louder) with the addition of these heads due to size and flow characteristics***
They are based off of a 99-06 model design with coil pack mounts and a machined front idle pulley if needed. The exhaust port arrangement has been moved to allow them to be used for all prior 4.0 head applications and header designs. You can use the TUPY or Stock style gasket, place your int/exh gasket order based on the header design.
We also recommend a complimenting cam package, ported Intake, 60mm and larger throttle body, fueling upgrades(injectors/tuning/500CFM & up carb) and header collector size of 2.5" or bigger depending where you want your power band.
***Lead time once order is placed for heads is around two weeks unless we have them ready on the shelf. As of 07/28/23***
Jeep/AMC 4.0 LS Converted Competition Cylinder Head.
$3,000.00
Only a few left!
Jeep/AMC 4.0 stock casting "Competition" LS converted Cylinder heads. We have changed our head production process and now these heads will all be custom built once your order is placed online and will normally take a 2-3 week turnaround time. At checkout, use the notes section to let us know your complete setup and usage so we can build your head to fit your application.
Our competition heads are meticulously built from the ground up with all the upgrades and best parts such as: 2.02"/1.60" Stainless Steel 8mm valves, competition 5-angle valve job, fully hand ported and polished, beehive springs w/steel retainers and locks, upgraded Viton positive locking valve seals, custom machined spring seats for added cam lift capacity up to .600" lift, machined guide holes for optional HD 3/8" pushrods, all fully assembled and ready to bolt on. ***We recommend this style head for Strokers, Boosted applications, or 'Hot' upgraded 4.0/4.2 engines with upgraded cam, intake and header with increased rpm potential to reap the rewards
.
***These heads depending on application and supporting mods will increase power levels from 25-75HP Naturally Aspirated and more with Forced Induction, with much added efficiency from the crack of the throttle to peak rpm. Your exhaust note and tone will change(Deeper/Louder) with the addition of these heads due to size and flow characteristics***
We also recommend a complimenting cam package, ported Intake, 60mm and larger throttle body, fueling upgrades(injectors/tuning/500CFM & up carb) and header collector size of 2.5" or bigger depending where you want your power band.
Undamaged cylinder head cores w/o cracks are "REQUIRED" or a core charge of $250 will need to be applied at checkout with all stock casting head orders.
Black is back!!!
Billet Valve Cover/Roller Rocker Spacer Kit(Raw or Black out)
$505.00 - $535.00
This is the most advanced and complete Billet Valve Cover/Roller Rocker Spacer to date. This spacer kit has a proprietary designed doweled/interlocking system to keep everything aligned for proper fitment, sealing and to squeeze in those big 1.6 or 1.7 Adjustable Roller Rocker Arms. This kit is designed retain the factory valve cover and its excellent breather/baffling system which most aftermarket covers DO NOT HAVE. Items included in this kit are the following: 5/8" Billet valve cover spacer(96-06 style valve cover), locating receiver dowels(96-06 12pt head bolts suggested not required), two black usable locating rubber valve cover gaskets, valve cover perimeter grommets, valve cover breather and PCV fittings w/grommets, Stainless Steel button head perimeter bolts or Stainless Studs w/Nylock nuts and AN washers to finish off everything so there's no rusty crusty looking mess down the road. Your choices will be "Raw or Black Out"
Jeep 4.0 Valve Cover Perimeter Grommet 7075 Billet Retainer Set(15 piece Raw or Black Out).
$150.00 - $160.00
Jeep made a great simple sheet metal valve cover design that does exactly what it is supposed to do which is: Not leak, Control oil splatter, Proper PCV control without excess oil consumption and acceptable looks. Mopar stopped making these retainers over 10 years ago so we answered another call and made them look even better! Our new 7075 Aircraft Aluminum Retainers are super lightweight, fit even better than factory and can be polished to a mirror finish or choose the Black Out version. These will work directly with our valve cover spacer/stud/bolt kit and our billet thermostat housing to clear that added height. ***Note*** This set will include (15) Machined Billet Retainers in your choice of "Raw or Black Out"
Jeep AMC 4.0 4.2 Revised Billet Aluminum Thermostat Housing 1971-2006
$235.00 - $245.00
Is it time for a new thermostat housing due to pitting, breakage, leaks, maybe after you add that new valve cover or spacer kit for those new roller rocker arms and now the thermostat housing hits or you just want the best damn housing on the market period then this one is for you. We have totally redesigned the AMC Jeep thermostat housing correctly with corrected outlet angles and solid billet aluminum construction that fits all years 1971-2006. We offer this housing in Raw or Black Anodized.
American Racing Jeep 4.0 Headers
$1,493.00 - $1,709.00
Finally a great solution for the dreaded Jeep 4.0 cracked exhaust headers. Not only that but they pack a big(1-5/8" or 1-3/4") with a long seamless primary tube with a rotational firing order that converges into a stretched out 6 in to 1 merge collector for that big deep sound that produces great overall power and DOES NOT CRACK. American Racing Headers feels so confident that they back it by a lifetime warranty.
If you combine this header with our Copper gasket and Stainless steel bolt and winged washer kit you will have a great looking and performing setup for the life of your 4.0.
If we do not have your header combination in stock, we have been able to acquire these headers faster than anyone in the industry. Check on the ***Update below for our current stock. Otherwise, you will be placing an order to have your header built.
Once your order is placed there will be no cancellations, I repeat you can not cancel your order once it has been placed.
Billet Roller Cam and Lifter Kits 4.0 4.2 Jeep AMC
$915.00
Newcomer Racing "Billet Roller" Cam Kits is the answer that we have all been waiting for and now we finally have a solid answer to the dreaded cast core flat tappet cam/lifter durability and supply issues.
Now let's get to the good stuff, these cams are 100% "Made in the USA" billet cores with the industry's best high-end Morel pressure feed needle bearing hydraulic & optional solid roller Tie-bar lifters that are a drop-in unit (No machining required). That means, no more wiped/failed cam lobes that will destroy your new or classic 4.0/4.2 engine. Our lobe designs are easy on the valve train with minimal noise unlike other companies yet take full advantage of that big roller lobe design.
-We also answered any cam sync/distributor gear issues with a custom Melonized gear. This will need to be a mandatory option when ordering a billet cam, factory or aftermarket gears are not compatible.
-Next, we have a brand new designed Rollmaster billet timing set with a built in Torrington bearing to control the thrust load between the block and the rear cam timing gear, which is an 4.0/4.2 industry first.
-For 1999-2006 "Thrust Plate" style blocks this will be a direct drop-in swap with our new true double roller timing set (You can also swap from the thrust style, back to the older style without any issues by simply ordering an older style kit).
-For 1964-1998 "Non thrust plate" blocks, you will receive a new Bolt/solid pin with shims to properly set your end play (You cannot swap to a newer thrust style cam).
You will need different pushrods with the new roller lifter height difference, and we have custom 5/16" or 3/8" .080" hardened pushrods ready (5/16" for all stock style heads or unmachined pushrod tubes, 3/8" for machined pushrod tubes or Edelbrock/Hesco heads). Since there are several factors that dictate pushrod length, we will need to know if the head and block have been decked, and how much. Then what rocker arm manufacturer. Worst case scenario, simply mockup up your combo and give us a call or place an order online. During your check out, you can type any needed info in the notes section.
We have so many awesome roller cam options available that picking your favorite cam can sometimes be a daunting process. That's why we added descriptions to each cam profile to help aid in your decision.
Basic things to consider when choosing your cam:
- RPM range and where you want your powerband.
- Application (Daily Driver/Off-road/Racing/Multi-purpose)
- Weight
- Transmission (Manual or Auto)
- Gearing
- Engine Size
- Compression
- Induction/Exhaust (Stock or Modified)
- Exhaust Tone vs Engine Smoothness at idle.
Our cam grind part numbers are as follows:
HR indicates "Hydraulic Roller", MR indicates "Mechanical Roller", NSR indicates "No Springs Required", SR indicates "Springs Required" and T is for "Trust Plate".
No Springs Required(NSR) which means you can run your stock springs but always check for coil bind. Stock spring specs are normally around 50-60lbs on the seat and 200-220 range open and good for around .460" lift.
"Springs Required(SR)" you will need to target 110-130(seat) and 275-325(open) pressures for most cams above NSR. For larger cams such as NR-130 and above, they may require more open pressure.
All of our cam spec numbers are based on a stock 1.6 rocker ratio. If you go to an upgraded 1.7 rocker ratio this will inherently raise your total lift values, so be aware when choosing for your springs max lift values. Our drop-in valve spring upgrade is able to handle up to .550"
On any of our cam kits or anyone else's for that matter, do yourself a favor and degree your cam, this will save you dividends in the end, trust us! Also, every single stock motor can benefit greatly from just a proper custom computer tune, we have done it, so we recommend custom tuning to maximize all that work and money invested to increase your usable power.
When other companies say no tuning required to get your sale, don't believe it, yes it will run, but no it will not be nearly as efficient. From the smallest cam to the biggest, the more you do to enhance the overall efficiency, from induction, exhaust or the rotating assembly on your setup, the better it will perform. This multiples and becomes more important as you go up in cam size.
NR-119-HR NSR(200/200 108 .425") Powerband idle-4,500rpm's This is the original High Output factory spec-based cam with a slight tweak for that factory feel, yet only better now in a long-lasting billet roller. This can be used as a drop in cam for stock style headed motors yet still leaves room on the table for an increased rocker ratio with the factory spring setup. "High Output"
NR-120-HR-NSR(208/212 112 .450"/.450") Powerband Idle-5,000rpm's with a deep smooth idle quality, great stock cam replacement upgrade that works with a stock stall converter and all stock components that can make great small quick spooling turbo or supercharger cam. "Mr. Smooth"
NR-121-HR-SR (212/216 110 .507"/.507") Powerband 1,200-5,500rpm's with a noticeable deep idle quality, the most aggressive cam we recommend using with stock springs. Works well with all stock vehicle components, with upgrades just keeps showing gains. "300HP"
NR-122-HR-SR (212/222 114 .507"/.544") Powerband 1,400-6,000rpm's with a noticeable deep idle quality, this is the first step up the ladder that requires a spring with more lift capabilities. This makes a great entry level cam combo with our competition head for those who want to utilize added lift, with our 1.7 roller rockers you will net .557"/.574", works with stock stall converter. "Lightning".
NR-123-HR-SR (212/208 112 .507"/.480") Powerband 1,200-5,400rpm's this is the weird cam profile of the bunch but don't let that fool you this little guy works awesome with a wide power band. This profile works well on any application and gives plenty of intake cylinder filling with the added duration. Stock short block or lower compression for low octane usage this is your cam. Works well with stock stall, increased lift springs required. "Odd Ball"
NR-124-HR-SR (212/212 114 .507"/.507") Powerband 1,200-5,600rpm's this little guy is a great all-around cam for naturally aspirated or forced induction combos. We have tested this one extensively in the "Mutt" 4.0 motor on the engine dyno (326hp/343tq on boost 550whp/600whp), on street, towing and racing. At a stock idle this cam will have a slight deep lope, increased spring rate and added clearance required. Works with stock stall converter. "Mutt"
NR-125-HR-SR (216/224 112 .507"/.544") Powerband 1,500-5,900rpm's this one will have a slight aggressive lope at stock idle. Now you're starting to get up in the cam area where induction and exhaust upgrades will start to become options to utilize the benefits of this cam. We have run this cam profile for 15+ years and made killer power numbers in daily drivers to all out-race rigs. This is a great starter in the aggressive cams yet yields great driving manners and yet you can twist that tach to 6,000 rpms. Still works with a stock stall, but with a 2,000-2,400 stall you will benefit. "Old Faithful"
NR-126-HR-SR (220/226 112 .544"/.544") Powerband 1,600-6,200rpm's now we are getting somewhere. This cam needs head, induction and exhaust upgrades to serve it well with more compression or forced induction this thing rips. We have made well over 400+hp with this cam with a built stroker. This one lopes without a doubt and with a 1.7 rocker it pumps out .578"/.578" lift. "Bump and Grind"
NR-127-HR-SR (228/228 113 .544"/.544") Powerband 1,900-6,200rpm's this mid-sized powerhouse single pattern cam will make some noise, the good kind. An all-around great performance cam for NA and boosted applications. Get your build on point to reap the benefits or simply throw the boost at it for an aggressive daily driver and set that idle to 750rpm's. "Boosted"
NR-128-HR-SR (228/232 110 .544"/.544") Powerband 2,000-6,200rpm's if you want to get noticed or hated this is your cam. With surprisingly great driving manners this cam with turn heads at the stop light with a healthy lopey idle quality. This one will need all the induction upgrades along with a 2,500 stall, manuals let it rip! Have your build with induction and exhaust upgrades on point and raise that idle to 800rpm's. "350HP"
NR-129-HR (234/234 113 .544"/544"). Powerband 2,400-6,400rpm's dual purpose single pattern powerhouse. If you want that aggressive chop at idle with your NA build or forced induction, this one fits the bill. For forced induction cam this top of the ladder for a daily driver/street machine. "Maniac"
NR-130-HR-SR (236/244 110 .585"/.585") Powerband 2,600-6,400rpm's now business is picking up. This can be a street/race cam with a very healthy lopey idle, no mistaking this bad boy is made to be seen. Stock idle will need to be raised to at least 800rpm's for a nice crisp pop out the tail pipe. With a 1.7 roller rocker this one hits .574"/.598" on lift, 2,600-3,000 stall required. "Street Terror"
NR-131-HR-SR (244/252 108 .585"/.585") Powerband 3,000-6,600rpm's talk about a noise maker this one fits the bill, straight up race or hard core street machine if you dare. If you have never heard a built inline with a nasty cam trust us they sound amazing, similar to a BBC if using a 6 to 1 header. This one is made for naturally aspirated applications where compression will be your friend. 3,000 stall required, or sticks, grab a good clutch and give it hell. "McNasty"
NR-132-MR-SR (264/272 106 .585"/.585") Powerband 3,600-7,200rpm's all out race only here unless you want to be a total badass on the street. This one needs compression, flow and some great parts so this thing can spin to 7,000+rpm's. A Jeep/AMC motor changes tones around 6,000 rpm's, the kinda tone that makes the hair stand up on your neck. Well, this one goes way past that point so hold on to your seat. With all the supporting mods this cam will make 500hp NA and make people cringe at the wicked snap crackle pop sound. Make sure you run a fully counter weighted crank at these rpm's. "Widow Maker"
**This PRE-ORDER listing is simply giving our customers the opportunity to be one of the first 40 people to receive a billet cam and lifter kit. This first official batch will be in by February, we will start dyno testing immediately at that point. Once dyno and durability testing is over, all pre-ordered cams will be immediately shipped to customers. There will be various upcoming videos, and a tutorial build video to follow.
***Tech tip for customers wanting to go with a more aggressive camshaft. To run a larger style camshaft that will turn over 5,500 rpm's you will absolutely need a harmonic balancer. Our ATI balancer will become a key component to achieve harmonic control of your in-liner. If you do not address this area it will absolutely create problems in trying to run higher rpm's.
2023 starts with online engine ordering reopened!!!
Stainless Steel HD Engine Lift Bracket w/SS Clevis and 16"x 1/2" drop chains
$325.00
Only a few left!
This is our in house designed engine lift bracket for those big, long, heavy engines that need the strength and the length but not to scratch up your new or old motor. We use these on everything and they work great for any platform from an Inline four, monster Cummins or Big block V8's. They are made from 1/2" 304 Stainless Steel with SS Clevis's, 3/8' chains and multiple hook placements(Center works best, normally).
Jeep AMC 4.0 4.2 Revised Billet Aluminum Thermostat Housing 1971-2006
$235.00 - $245.00
Is it time for a new thermostat housing due to pitting, breakage, leaks, maybe after you add that new valve cover or spacer kit for those new roller rocker arms and now the thermostat housing hits or you just want the best damn housing on the market period then this one is for you. We have totally redesigned the AMC Jeep thermostat housing correctly with corrected outlet angles and solid billet aluminum construction that fits all years 1971-2006. We offer this housing in Raw or Black Anodized.
Jeep AMC 4.2 258 Stroker Long Snout "Black Anodized Billet Crank Spacer"
$42.00
If you are running an early 258 (4.2) non-serpentine crank for your Stroker you will need to either cut the crank snout or simply run one of our new "Black Anodized Billet Crank Spacers". These are designed to work with stock and aftermarket harmonic balancers, reuse your stock "Thick" crank washer and make sure your stock bolt has enough thread engagement. ***Attention, the O.D(Outer Diameter) was based off a neutral size so they would fit most all balancers though some balancers will be tighter than others due to inconsistences of manufactures.
Jeep 4.0 Valve Cover Perimeter Grommet 7075 Billet Retainer Set(15 piece Raw or Black Out).
$150.00 - $160.00
Jeep made a great simple sheet metal valve cover design that does exactly what it is supposed to do which is: Not leak, Control oil splatter, Proper PCV control without excess oil consumption and acceptable looks. Mopar stopped making these retainers over 10 years ago so we answered another call and made them look even better! Our new 7075 Aircraft Aluminum Retainers are super lightweight, fit even better than factory and can be polished to a mirror finish or choose the Black Out version. These will work directly with our valve cover spacer/stud/bolt kit and our billet thermostat housing to clear that added height. ***Note*** This set will include (15) Machined Billet Retainers in your choice of "Raw or Black Out"
"HIGH OCTANE" Jeep 4.6-4.7 Stroker Engine Package
$11,200.00
For those who want the stoutest most reliable 4.6-4.7 liter street Jeep stroker available on the market that still retains factory manners and dependability as long as you don't mind running premium octane fuel hence the name. We have done our research and developed an elite engine package that utilizes our custom made hypereutectic pistons and lightweight rings with the highly desired 6.125" (Long)rods, with 10.0:1(66cc open chamber), 10.3:1(63cc closed chamber), 11.4:1(55cc Edelbrock aluminum head).
You may ask why Hypereutectic pistons and not forged? For a naturally aspirated engine that see's daily driving and hot rodding in all types of weather you can not beat a well designed Hypereutectic for quiet operation, excellent long life, anti-scuffing and sealing ability. To this point there has not been a hypereutectic option with a 6.125"(Long) rod option so we made one and created a new animal. From the factory the original 4.2(258) started life around 100hp to eventually topping out around 190hp by the 4.0(242). "HIGH OCTANE" at 4.6-4.7 liters is another animal all together, on our dyno this package pumped out 366hp and 373ftlbs of torque with one of our less aggressive cams. With this package we can custom tailor the cam to suite your needs and bring the power in where you want it.
Recommendations: Intake/Intake/Intake did we say Intake, to totally utilize this package we recommend an extremely ported stock intake manifold or custom setup(Sheetmetal) with an oversized throttle body(These are not mandatory items just recommended), header with 3" collector and a custom tune is MANDATORY with 91 octane minimum. Manual transmissions require clutch upgrade such as Mcleod or Centerforce. Automatic transmissions say a prayer then prepare for a moment of silence unless built or shift kit(Except AW4's, if they are healthy they seem to hold up well).
***Every single engine that is built and sold through Newcomer Racing(least to most expensive) has the minimum following items performed during the build process: All Blocks are Ampro baked and SS shot blasted, magnufluxed, deburred, bored and torque plate honed, line honed, decked for proper quench, full rotating assembly balancing, every single bearing is checked and set to size, cam and lifters deburred and polished, heads resurfaced, guides honed to size, competition valve job, spring install heights set accordingly, cam preload or lash set, high zinc break-in oil used during the engine dyno session, new break-in oil installed before it ships to your location.
***Engine builds once order is placed are running between 1.5-2 months on build time as of 04/01/25
***BUNDLE PACKAGE*** Extreme Duty Copper Intake/Header Gasket & Stainless Steel Winged Washer kit.
$256.00
We heard your request so we added a BUNDLE PACKAGE for our very popular "Copper intake/exhaust gasket" and "Stainless Steel Winged Washer/ARP bolt kit". With this option you will save $7.00 off the total of both items and only shipping costs will be applied for one item, typical savings average around $31.00 when bundled.
Billet Valve Cover/Roller Rocker Spacer Kit(Raw or Black out)
$505.00 - $535.00
This is the most advanced and complete Billet Valve Cover/Roller Rocker Spacer to date. This spacer kit has a proprietary designed doweled/interlocking system to keep everything aligned for proper fitment, sealing and to squeeze in those big 1.6 or 1.7 Adjustable Roller Rocker Arms. This kit is designed retain the factory valve cover and its excellent breather/baffling system which most aftermarket covers DO NOT HAVE. Items included in this kit are the following: 5/8" Billet valve cover spacer(96-06 style valve cover), locating receiver dowels(96-06 12pt head bolts suggested not required), two black usable locating rubber valve cover gaskets, valve cover perimeter grommets, valve cover breather and PCV fittings w/grommets, Stainless Steel button head perimeter bolts or Stainless Studs w/Nylock nuts and AN washers to finish off everything so there's no rusty crusty looking mess down the road. Your choices will be "Raw or Black Out"
https://bangshift.com/bangshift1320/most-powerful-4-0l-jeep-engine-ever-built-make-860-hp/
https://www.enginelabs.com/news/video-building-the-worlds-most-powerful-jeep-inline-6-engine/
https://www.roadandtrack.com/news/a34345852/861-hp-jeep-straight-six-dyno-video/
https://www.thedrive.com/news/36982/tuner-pushes-the-legendary-jeep-4-0-liter-straight-six-all-the-way-to-861-hp
Stainless Steel Intake/Exhaust Flange Winged and Round Pinch Washer kit w/ARP 12pt Stainless Steel bolts.
$149.00
We tried to answer the call for intake and header flange fitment issues with an alternative solution that looks much cleaner and never rusts. This newly designed Winged Polished Stainless Steel washer can be rotated to fit multiple locations or reach the intake casting that the factory round washer could not quite reach before and has enough bore clearance to allow the washer to articulate on uneven surfaces. This kit will feature (8)Winged, (3)Round-for exhaust ends/center and (11)ARP 12pt polished SS bolts.
"Record Breaker" Newcomer Racing T-shirts
$20.00
Fresh off the presses, Newcomer Racing "Record Breaker" T-shirts are in stock and ready to ship. These Tee's are 65% Polyester 35% Cotton, which makes them both comfy and soft, yet highly durable. They are available in Black(w/red & green design) and Heathered(w/green & red design), in all popular sizes.
Newcomer racing hats
$21.00
We have two styles of hats: Solid Black and Black/White Trucker style stretch.
Extreme Duty Lifetime .060" Annealed Copper Intake/Header Gasket
$121.00
This all-new custom designed Newcomer Racing exclusive "Copper" Intake/Header gasket answers the call for many issues related to the 4.0 based Jeep head. First off we list this as a lifetime gasket that can be reused time and time again with just a simple gasket cleaning and reapplication of the provided High Temp Silicone. Secondly it does not have to be trimmed like all stock gaskets to fit the stock or highly ported versions and it serves as a great porting template for our in house port designs.
We offer three designs to fit your needs: Stock(87-99)/Edelbrock, TUPY(99-06), then our updated True round port design for our 1/2" Stainless Steel Custom Header flanges for your custom header builds. Simply choose your head style at the checkout. Our Stainless Steel ARP fastener/Winged Washer kit compliments these gaskets well! As noted this wrapped gasket will come in an indestructo box with a full tube of high temp silicone for many uses if needed.
***Use your supplied silicone on both copper gasket sides, around the intake and exhaust ports. We normally keep the intake port coverage on the thin side, depending on the intake flange condition. The exhaust ports we apply more and allow adequate time to cure, overnight is best but not necessary. As far as the fastener torque, YES, which means damn tight! and recheck after a good heat cycle.