Power Items
68mm "Wide Mouth" Throttle Body
$495.00
Only a few left!
The 68mm "Wide mouth" throttle bodies are here and ready to add some needed air to your power plant. We have always had positive dyno gains with these throttle bodies on anything from stock to a maxed out stroker.
If you compliment this throttle body with one of our Ported 70mm intake manifolds, either in the stock casting form or the sheet metal plenum you will see huge gains in air flow and power potential.
Otherwise, to utilize these big throttle bodies, your stock intake manifold opening(62mm) will need to be machined to accept the oversized(68mm) opening.
Port Matched 70mm Jeep 4.0 Intake Manifolds(Stock Castings)
$630.00 - $810.00
Only a few left!
We brought them back, that's right we now carry Port matched Jeep 4.0 stock casting intake manifolds in all styles. If you looking for that added kick in the seat of the pants this is an easy upgrade. Whether it's a stock 4.0 or a big stroker these manifolds will add hp and tq across the board with killer throttle response.
All manifolds are cleaned, blasted, gasket matched to our Copper intake/exhaust manifold gasket. The runners have been greatly opened up from the very restrictive factory injector bung area and the throttle body openings have machined to 70mm if you decide to upgrade to an oversize throttle body.
You can simply choose your current year intake manifold or mix it up depending where you want your power delivered. Make sure when choosing a manifold to select either your current year or the matching power steering mount pattern/style.
How to choose your manifold: The early Straight Runner Manifolds make great mid-range and top end power(Stockers or Strokers with a slightly aggressive cam will benefit in the upper power band). The later Curved Intake Manifolds absolutely make more power off idle for you low end to mid-range power lovers with those long runners and big plenum(Small cu in or small cam lower rpm seekers this is your intake).
If you are retro-fitting an older straight runner to a newer curved style you will need to choose the "99-04 Curved w/o harness bosses.
**While supplies last we are offering our in house 60mm Taper Bore Throttle Bodies as an option, these work great on stock motor upgrades or low to mid rpm response.
***CORE REQUIRED, if you do not have a usable core of the same intake manifold as you purchased then you will have to choose and pay the associated core charge at checkout. If you do have a usable core then simply ship it back in the same box as delivered. You will be responsible for shipping charges.
****As of 01/09/24 we have added High Temp Cerakote coated intake manifolds to the options list. We have used this coating now for a few years on intakes, headers, etc with great success. This coating is good to 1,800 degrees and is currently available in Black and Silver.
Jeep 4.0 1/2" Billet Aluminum Intake Flanges
$245.00
Only a few left!
Build your own intake or have one built with these precision laser cut 1/2" Billet intake manifold flanges for the 4.0 Jeep cylinder head. These flanges match our Copper gaskets, you can build your intake runners to mount flush on the flange or inside for a smaller port size. The tall flange provides multiple mounting points for the factory or aftermarket harness/NOS or random items depending on your layout. If you choose not to utilize the tall flange, build your intake completely before you mill the top off so your intake will stay in place during the welding process. ***Our Stainless steel header flange with this intake flange are made with a slight interference fit so you can clearance either one to fit your application best. This listing is for the "FLANGE ONLY", the intake in the pic is one of our in house intakes used as a reference for what can be accomplished.
Extreme Duty Lifetime .060" Annealed Copper Intake/Header Gasket
$115.00
Only a few left!
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.
Stainless Steel Intake/Exhaust Flange Winged and Round Pinch Washer kit w/ARP 12pt Stainless Steel bolts.
$143.00
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.
***BUNDLE PACKAGE*** Extreme Duty Copper Intake/Header Gasket & Stainless Steel Winged Washer kit.
$250.00
Only a few left!
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.
Jeep/AMC 4.0 LS Converted Competition Cylinder Head.
$2,800.00
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.
Jeep/AMC 4.0 CNC Competition Cylinder Head(91-06)
$2,750.00
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 4.0 Cylinder Head 1/2" Alumium "Block-off Plate"
$103.00
When you need to seal up an engine for storage, shipping, that backup race motor or built head thats finished but not quite ready to install then protect it with these Cylinder Head Block Plates. These are designed for any 4.0 Jeep Cylinder head including aftermarket versions.
Newcomer Racing Revised "True Round Port" & OEM Style "D Port" 1/2" 304 Stainless Steel Header Flange
$215.00
Only a few left!
We have both the upgraded OEM "D-port" style and the new revised round flanges. The revised header flange design is to be uses in conjunction with our matching "Newcomer" Copper Intake/Exhaust header/manifold gasket. We have redesigned the original Factory D-port into a true round port on all exhaust ports with a 1-3/4" slip in fit or 1-7/8" flush fit depending what primary tube size you prefer. We have purposely left material thick between the runners where the intake is seated, that being said you need to clean-up/grind the intake casting flaws to fit between the header flange properly. ***TIP***When fabricating your own header we suggest bolting the header flange down flat in as many places as possible on a head, welding everything up accordingly then check for straightness. DO NOT be scared of a curve in the flange(this is normal), once its all bolted down they will lay out great without leaks. We are kind of biased but we suggest our Stainless Steel Winged Washer Kit to finish off your custom build. Now go make something cool, send us the pics we want to see and share it!
American Racing Jeep 4.0 Headers
$1,493.00 - $1,709.00
Only a few left!
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.
***Update***
As of 10/23/24, we have purchased FIVE SETS of TJ 1-5/8" x 3.00" w/o cats and TWO SETS of XJ 1-5/8" x 3.00" header kits that are ready to ship.
Jeep AMC 4.0 4.2 Stroker (87-06) Direct Replacement ATI SFI Approved Harmonic Six Rib Serpentine Balancer Kit
$880.00
Only a few left!
We had to address our own issues and the Jeep/AMC community with the effects of upper rpm crank shaft harmonics and safety concerns with the only available options being factory replacement dampers. If you race or spin your 4.0 or 4.2 based Jeep/AMC engines above 5,000 rpm's then this kit should be on your wish list. The difference between a factory balancer and our ATI balancer on the dyno is totally night and day, silky smooth!!! The factory balancers tend to have a harmonic(vibration) or a pitch change starting sometimes as low as 5,000 rpm's. Our new billet hub and modified ATI balancer setup eliminates everything and we've twisted these to 7,000 rpm's without the thought of an issue and they are 2lbs lighter. You will also have the option to bolt on another front mounted pulley(Three bolts/ARP stainless 12pt) for that supercharger or added accessory with a common three bolt pulley pattern. Your kit will include: Pre assembled six rib serpentine balancer/damper with tapered flat head stainless bolts, (3)12pt Stainless ARP bolts(Added pulley option), black plated billet hub keyed and indexed to the factory zero timing mark(No more guessing on timing with 360 degrees of timing marks on the damper), Crank bolt(Reuse your factory thick washer), extreme pressure assembly lube, blue and red locktite with full assembly instructions. ***This listing is for SERPENTINE BALANCERS ONLY, not v-belt balancers.
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.
Billet Valve Cover/Roller Rocker Spacer Kit(Raw or Black out)
$495.00 - $525.00
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 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 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 "Lightweight" Roller Rocker Arm Kits(1.60/1.70, Fixed & Adjustable)
$540.00 - $670.00
Only a few left!
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).
Stainless Steel HD Engine Lift Bracket w/SS Clevis and 16"x 1/2" drop chains
$325.00
Sold out
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).
70mm "Wide Mouth" Throttle Body
$545.00
Only a few left!
The 70mm "Wide mouth" throttle bodies are here and ready to add some needed air to your power plant. We have always had positive dyno gains with these throttle bodies on anything from stock to a maxed out stroker.
If you compliment this throttle body with one of our Ported 70mm intake manifolds, either in the stock casting form or the sheet metal plenum you will see huge gains in air flow and power potential.
Otherwise, to utilize these big throttle bodies, your stock intake manifold opening(62mm) will need to be machined to accept the oversized(70mm) opening.
***We are currently on a two week backorder as of 11/01/24
Sheet Metal Plenum 70mm Intake Manifold
$1,400.00
Only a few left!
Our sheet metal intake manifolds are based off 96-98 straight runner intakes. We remove the factory plenum, completely port intake runner to max capacity all the way through, fabricate and weld a larger sheet metal plenum, mill the intake flange flat and enlarge the throttle body opening to 70mm.
We have ran these on many different engine packages with great success over the years. To see the potential in this style intake you will need: a higher revving 4.0(Ported head/big cam)or a Stroker(Ported head/Cam), a ported head is a must to utilize the added airflow capabilities.
With the addition of this intake on a built Stroker with increased rpm potential, you will have potential huge gains in power(30-80hp) from the 3,000-7,000 range. On a big inch 4.8-5.0 Stroker that has good head potential with a smallish cam these work great from idle through the 6,000 rpm range and with a larger cam they just make more power.
These intakes only fit 96-06 or simply add the newer style power steering mounts to any older version then you can run this style intake. We recommend a 24lb minimum injector size, in most cases a 36-48lb injector will be required for NA builds.
When ordering you will need to provide a good salvageable 96-98 core, if not then you will need to pay the core charge. We have based the core procedure off "Good faith" on the customer part.
Jeep/AMC 4.0 Stroker Custom Built Dual 60mm Throttle Body Ported Intake Manifold Assembly
$2,100.00
Only a few left!
We are offering a one off custom built dual 54mm throttle body sheet plenum fully ported intake manifold assembly. This is complete unit with sensors and everything as shown. This intake will fit any XJ/TJ/ZJ/WJ/YJ with the use of a 96 and newer style power steering pump/bracket/idler assembly or any 1996 and newer Jeep. You will simply need to add your necessary injector size, 24lb minimum. We recommend a stroker combination or a healthy high winding 4.0 to utilize the air flow capabilities.
4.8 Stroker Hypereutectic Coated Piston/Pins/Clips/Rings Kit.
$495.00
We have decided to share our custom designed Hypereutectic coated pistons and custom file fit rings to everyone else. This was a two year wait to have these produced. You will not find a better piston and ring combo on the market that covers so many applications, such as: Daily drivers, weekend warriors, racing, boosted applications.
We have built many different combos with these from extremely small cam combos to whopper cam combos. The minimum Hp made to date is 350hp and the most naturally aspirated is 428hp. There are no piston to valve clearance issues to worry about unless extreme head milling or high lift/duration cams are used. These pistons feature a 14cc dish designed to run with a 4.060" stroke crank and a 6.125" bushed or pressed connecting rod making 4.8 liters and above. Eagle makes the crank and rods, as well as SCAT makes a great full floating(Bushed) connecting rod.
These are full custom built rings(1.2/1.5/2.5mm) and it shows. When you compare shortblock turning torque and sealing properties there is no comparison. A normal fresh built factory style shortblock will have a turning torque of anywhere from 24ftlbs to 32ftlbs. Our bushed piston and ring package even with the longer stroke takes only 12ftlbs-16ftlbs to rotate and the sealing properties are awesome.
All of this means less wear, better sealing, less drag for much more power. You will need to have a quality machine shop set piston to cylinder wall clearances and deck block accordingly. This kit includes, Pistons, Pins, Clips, and Rings ONLY!!!
Compression ratios will differ depending on deck height, combustion chamber size, bore size, gasket thickness. Do your research on your exact combination. Here are a few example:
Bore-3.905"/Stroke-4.060"/Gasket Thickness-.041"/Deck Height-.000"/Dish-14cc/Chamber Volume-63cc=10.33:1
We prefer the following Piston/Ring clearances:
(Street) Wall clearance: .002"-.003"/Rings: Top .0018"-.0021" Second .0018-.0022"
Scrapper .0015"(Minimum)
(Race) Wall clearance: .003"-.005"/Rings: Top .0021"-.0024" Second .0022"-.0026"
Scrapper .0015"(Minimum)
(Boosted) Wall clear: .003"-.006" /Rings: Top .0022"-.0026" Second .0024"-.0028"
Scrapper .0015"(Minimum)
AMC/Jeep Stroker 4.2 258 3.895" 12CW Crank Fully Balanced w/Bearings
$995.00
Only a few left!
We are offering up some of our best fully counterweighted 258 cranks, which have been totally refurbished and balanced with in +/- .5 gram. If your looking for the strongest, smoothest, best performing crank then you found the right place. We have made well north of 800HP and 8,000rpm's(W/ATI balancer). These come with matching King rod and main bearings.
ARP 4.0/4.2 Int/Exh Stainless Steel Winged Washer Stud and 12pt Nut Kit
$198.00
If for some reason our ARP Winged Washer/Bolt kit just isn't your flavor, then maybe this gorgeous ARP Stud kit will do the job.
Either combo will work great and be miles ahead of the ancient, clapped out, rusty stock units. This kit comes with all the required SS int/exh studs(11), with 12pt SS nuts and SS washers. NO MORE RUST!!!
We highly recommend always using anti-seize(Copa-Slip) on any stainless thread to avoid gaulding of the threads.