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Engines & Engine Parts
Welcome to your headquarters for horsepower—the place to get everything you need to build real power and performance! We’ve got competition-proven crate engines, performance-matched...
Welcome to your headquarters for horsepower—the place to get everything you need to build real power and performance! We’ve got competition-proven crate engines, performance-matched top end kits, and complete rotating assemblies from the biggest names in the industry. You can add a set of high-flow cylinder heads to your powerplant, upgrade your valvetrain, improve your oiling system, or drop in a new set of pistons. We also have a complete selection of crankshafts, connecting rods, harmonic balancers, pulleys, and engine brackets. We even have everything you need to restore the horsepower that time has stolen from your...
Welcome to your headquarters for horsepower—the place to get everything you need to build real power and performance! We’ve got competition-proven crate engines, performance-matched top end kits, and complete rotating assemblies from the biggest names in the industry. You can add a set of high-flow cylinder heads to your powerplant, upgrade your valvetrain, improve your oiling system, or drop in a new set of pistons. We also have a complete selection of crankshafts, connecting rods, harmonic balancers, pulleys, and engine brackets. We even have everything you need to restore the horsepower that time has stolen from your daily driver.
ARP Main Stud Kits
ARP main stud kits help eliminate main cap walk/fretting and protect the threads in your engine block. They include studs made from 8740 chromoly steel and heat-treated in-house to 190,000 psi tensile-strength rating. The precision J-form threads are rolled after heat-treat for much stronger threads than the competition. Kits come complete with hardened parallel-ground washers and high-quality nuts. Add confidence in the strength of your engine build with the ARP main stud kit designed for your application.
( 394 )
$34.99
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$376.99
Moroso Main Cap Girdles for Ford
Moroso main cap girdles for Ford are designed to fit 289-302 c.i.d. engines using a 2-bolt main block. They are manufactured from 1/2 in. thick steel and can fit over main caps without the need for additional spacers. The girdles include all necessary mounting hardware and will fit standard high-volume oil pumps.
( 10 )
$334.99
Crower Lash Caps
Crower lash caps protect the ends of your valves from excessive wear and help to correct rocker geometry by increasing rocker arm to retainer clearance. Machined from high-grade chromoly steel and heat-treated for added strength, they give your valves an added .060 in. margin of protection. Highly recommended for performance applications, they're a must for costly stainless steel or titanium valves.
( 4 )
$6.99
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$112.99
Summit Racing™ Main Bolt Kits
Make sure your crankshaft is secured properly using a set of these Summit Racing™ main bolt kits. They include high-tensile strength bolts that deliver maximum reliability where you need it the most. The bolt kits are designed for use with stock or aftermarket main caps, and can be installed without any modifications.
( 10 )
$209.70
Proform Oil Filler Caps for Chevrolet
These Proform oil filler caps are available two different ways: A push-in style with an embossed Bowtie to complement the genuine factory-parts appearance of the engine; and a twist-on style with a large white-on-blue, epoxy-coated GM emblem in the center. Either one is sure to get your attention.
( 41 )
$6.99
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$14.95
On Sale
Scott Drake Valve Cover Oil Caps
Brighten and freshen up your engine compartment with a Scott Drake oil cap. These Scott Drake oil caps not only look sharp, but they will also keep oil in its place.
( 93 )
$58.55
$24.10
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$84.85
Manley Valve Tip Wear Caps
Manley valve tip wear caps protect the tip of your valve stem in high-rpm engines. They are constructed from 4140 heat-treated alloy steel, strong enough to handle harsh racing conditions.
( 19 )
$3.61
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$125.91
Chevrolet Performance Valve Lash Caps
Chevrolet Performance valve lash caps help to safeguard the ends of your intake valves from unnecessary wear caused by continual pounding. Lash caps increase the clearance between rocker arms and retainers, adding a margin of protection. These steel caps are available for various applications, such as LS7 and LS9 engines.
( 1 )
$29.99
COMP Cams Valve Lash Caps
In today's higher rpm engines, the tip of the valve stem is subjected to a tremendous pounding. The best solution to this problem is COMP Cams' lash caps. These hardened lash caps are precision-machined and ground perfectly flat, to maintain accurate valvetrain adjustment.
( 33 )
$8.95
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$80.95
PRW Billet Steel Main Girdles
PRW billet steel main girdles help eliminate the block flex and cap walk that occurs as a result of stress while under extreme loads, or during nitrous oxide power bursts in high performance engines. PRW main stud girdles are manufactured from premium quality 1045 billet steel, and include high-quality PRW fasteners and hardware. Select the girdle designed for your vehicle's engine.
( 2 )
$174.59
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$252.72
Milodon Main Caps
Milodon aftermarket main bearing caps not only strengthen factory 2-bolt blocks, but they will also add a measurable degree of strength to 4-bolt blocks. They are made from precision-machined, high-strength steel, which has the proper balance of strength and flexibility to allow for the transfer of increased shock loads to the crank and bearings. The secret is in the side bolts. They are angled so that they pull from the side walls of the block and not from the flimsy main web area. They'll also load the cap against the register step, which will prevent dreaded "cap walk." They can be installed by anyone with a hand drill and a tap and they come with the necessary bolts, washers, and drill bushing to complete the installation. Milodon main cap kits are available in your choice of angled or straight bolts.
( 20 )
$119.95
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$679.95
Spectre Performance Valve Cover Oil Fill Caps
Spectre valve cover oil fill caps are designed to be pushed into your standard 1.25 in. valve cover breather hole. They include a rubber grommet and can be installed in just seconds. The caps are available in your choice of steel or aluminum, so you can match up what's best for your engine style.
( 29 )
$8.99
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$9.99
ACDelco GM Genuine Parts Engine Oil Fill Caps
ACDelco GM Genuine Parts engine oil fill caps provide the perfect OE replacements without breaking your budget. They are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Choose the cap style designed for fitment on your particular engine block.
( 14 )
$3.99
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$22.99
Holley LS Engine Oil Fill Caps
These Holley LS engine oil fill caps are designed to remove the factory oil fill tube on LS engines and replace it. They are manufactured from glass-filled material to ensure durability. The Holley LS engine oil fill caps include a billet aluminum insert that can easily be painted or powdercoated and a domed Holley decal that can be placed in the insert or directly on the caps' base. The caps screw directly into all stock valve covers and fill tubes on LS2, LS3, LS7, LS9, and LSA engines.
( 2 )
$18.23
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$44.79
ARP High Performance Series Main Bolts
ARP High Performance Series main bolts are rated at 180,000 psi and a popular premium replacement for OEM fasteners. Designed to meet the exacting standards and demands of professional engine builders, ARP bolts are forged from 8740 chromoly steel and feature a reduced wrenching head, large underhead radius, and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.
( 179 )
$33.99
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$414.99
PRW Oil Filler Caps
PRW oil filler caps bring high-quality and good looks to your oil filling needs. Made of premium materials and available in multiple finishes to complement your build, these oil filler caps are designed as universal installations. Features include: * Knurled, threaded cap for a no-slip operation * O-ring sealed to prevent vacuum or blow-by leakage * Only requires a flat hole for installation
( 2 )
$27.24
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$27.57
Mopar Replacement Engine Oil Filter Canister Caps
Mopar Replacement engine oil filler canister caps are genuine OEM Mopar replacement parts. That means your Chrysler, Dodge, Plymouth, or Jeep will receive the perfect part to repair and/or restore performance, just as it should be. These engine oil filter canister caps are made from high-quality material to provide reliable, long service with the right fit, function, and value.
Not Yet Reviewed
$22.99
BTR Main Cap Fasteners
Brian Tooley Racing offers main cap fasteners for a variety of Chevy small block engine applications from 1997 and up. These bolts are used to secure the main bearing caps to ensure proper operation of the crankshaft. The fasteners are stock replacement bolts for Gen III and Gen IV LS engines, available with or without a windage tray provision.
Not Yet Reviewed
$3.99
Trans-Dapt Performance Chrome Oil Caps
Trans-Dapt chrome and rubber oil caps are designed for use on a wide range of car and truck applications. They are available in plain and with the "OIL" logo. No grommet is required for installation.
( 6 )
$7.99
Summit Racing™ Valve Cover Oil Fill Caps
Dress up your engine compartment while keeping oil in its place and the dirt at bay with Summit Racing™ valve cover oil fill caps. They're manufactured from high-quality material, providing a proper fit and seal to prevent oil loss. These round, steel caps are available to fit a variety of applications, including GM, Mopar, Ford, AMC, Jeep, and other make/model vehicles. Whatever your part needs, chances are Summit Racing™ has it!
( 39 )
$4.99
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$50.99
Chevrolet Performance Main Cap Fasteners
Keep your main caps secure with a set of Chevrolet Performance main cap fasteners. They are made from quality OEM materials and are built to strict tolerances to ensure a direct fit. You don't ever want to have a failure in your engine's rotating assembly. Pick up Chevrolet Performance main cap fasteners for maximum reliability.
( 6 )
$5.99
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$9.99
Radium Engineering Oil Filler Caps
Radium Engineering oil filler caps are anodized billet aluminum designed to fit many General Motors vehicles. These replacement caps will work on both dual and single-tooth oil fill neck types and the 7/8 in.-14 threaded port accepts 10AN ORB adapter fittings to create a custom crankcase venting setup. A 10 AN ORB plug is included to block off the internal baffle, and it can be unscrewed and removed. Underneath is a cleanable and reusable stainless steel baffle for air/oil separation.
Not Yet Reviewed
$47.45
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$104.45
The Stop Shop Large Ear Twist-On Oil Caps
The Stop Shop's large ear oil caps with a twist-on design serve several key purposes in an engine. The primary purpose is to seal the opening where you add motor oil to the engine, and help prevent dirt, debris, and other contaminants from entering the engine's internal components, which could cause damage. The "large ear" design on the cap makes it easier to grip and "twist" on and off, especially when compared to a standard, smaller oil cap. When located on a valve cover, they help prevent oil from splashing out during engine operation. These round-shaped oil caps are often chrome-plated and can provide a visually appealing custom touch to the engine bay.
Not Yet Reviewed
$18.99
Trans-Dapt Performance Oil Fill Caps
These oil fill caps from Trans-Dapt are a great looking way to add some class under the hood while topping-off your oil system. They're available in a variety of styles and finishes to suit your needs.
( 17 )
$4.99
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$42.99
