Engines & Engine Parts

Summit Racing™ HDR Thickwall Chromoly Pushrods

Summit Racing™ HDR premium thick-wall pushrods are a great upgrade for your engine. Factory pushrods (and even .080 wall aftermarket versions) act like a pogo stick in a running engine. Not only is static spring pressure working against them, it's also the valvetrain inertial mass increasing with RPM. This reduces power and valvetrain life. While a .080 thin-wall pushrod may not break, it doesn't mean it's the best option. Enter the HDR's. Summit™ used FEA (Finite Element Analysis) in the initial testing. We didn't just compare them to thin-wall welded-ball factory pushrods, but with aftermarket models, as well. The results speak for themselves! * The Summit™ HDR 5/16 x .105 wall pushrods have 20 percent less stress and 25 percent less deflection than a typical 5/16 x .080 chromoly pushrod * The Summit™ HDR Pro LS 11/32 x .120 wall have 25 percent less stress and 28 percent less deflection than a typical 5/16 x .080 wall chromoly pushrod * The Summit™ HDR 3/8 x .135 pushrods commonly used in big blocks has 15 percent less stress and 20 percent less deflection than a typical 3/8 x .080 wall chromoly pushrod Summit Racing™ added other high-end features like 210 degree ball ends to cope with extreme lobe lift and clear the rocker and are available in multiple lengths. * HDR 5/16 pushrods are offered in common LS, SBC, and SBF lengths * HDR Pro LS 11/32 pushrods add .030 diameter AND .120 wall thickness over a 5/16. Although most LS engines came with 5/16 pushrods, 11/32 pushrods fit any stock or aftermarket cylinder head. The added thickness adds much needed strength to any LS cam swap or engine build. Being available in .025 in. increments allows for fine tuning of hydraulic lifter preload with the LS's non-adjustable rockers. * HDR 3/8 pushrods fit the LS7 and common BB Chevy combinations. They have .135 wall thickness for maximum strength. Pushrods are some of the best horsepower-per-dollar components in your engine, so step up to the HDR's for your build!

4.86 out of 5 stars ( 59 )

Melling Pushrods

Melling OEM replacement pushrods are perfect for stock rebuild or mild performance applications where open spring pressures do not exceed 300 lbs. They're manufactured from steel tubing and work well with factory or aftermarket rocker arms. These units are available in a wide range of lengths and other options for fitment on countless makes and models. When you're replacing your valvetrain components, trust Melling pushrods to keep your engine running smoothly.

4.56 out of 5 stars ( 81 )

Chevrolet Performance Pushrods

Chevrolet Performance offers a complete line of heavy-duty pushrods for most GM engines. They're designed to deliver in high performance street and competition applications. Made of high-quality materials, these pushrods are available in a variety of sizes and style options to suit your needs.

3.33 out of 5 stars ( 3 )

COMP Cams XD-A Pushrod Shims

COMP designed their XD-A adjustable pushrods with a top section that slides 2 in. inside a wider bottom section, with one or two shims captured in-between. These COMP Cams XD-A pushrod shims allow the pushrods to be adjusted over a range of 0.172 in. in 0.004 in. increments. Order the shim thickness and quantity needed.

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ATK High Performance LS3/L92 255cc Aluminum Cylinder Heads

ATK high performance LS3/L92 25cc as cast aluminum cylinder heads are the perfect budget option for your next LS build. These fully assembled heads are capable of making over 600 hp naturally aspirated out of the box and will come loaded with upgraded components. The springs are set up to be used on up to .650 in. lift camshafts. No reason to swap parts on your new heads when running an upgraded cam! -- Features and benefits: * Bronze valve guides * Dual valve springs for .650 in. max lift * CNC-finished faces and bolt holes for extreme accuracy * 355-T6 high density aluminum * Machined for screw in studs and guide plates * All factory components will fit without modification -- Cylinder Head Specifications INTAKE: * Intake Runner Volume (cc): 252 * Intake Port Location: Standard * Intake Valves Included: Yes * Intake Valve Diameter (in): 2.160 in. EXHAUST: * Runner Volume (cc): 78.8 * Exhaust Valve Diameter (in): 1.600 in. * Exhaust Valves Included: Yes * Exhaust Runner: No * Port Shape: Round * Exhaust Port Location: Standard COMBUSTION CHAMBER: * Combustion Chamber Volume (cc): 69.4 * CNC-Machined Combustion Chamber: No VALVE SPECS: * Intake Valve Angle: 12 degrees (3 degrees rolled) * Exhaust Valve Angle: 12 degrees (3 degrees rolled) * Valve Guides Included: Yes * Valve Guide Material: Manganese Bronze * Valve Seats Machined: Yes * Valve Seat Machine Style: 5-Angle * Valve Seat Material: Chrome Nickle * Valve Stem Seals Included: Yes * Valve Stem Seal Style: Viton® Fluoroelastomer SPRINGS: * Valve Springs Included: Yes * Maximum Valve Lift (in): .650 in. * Spring Pressure Open: 370 @ 1.150 * Spring Pressure Closed: 142 @ 1.800 * Outside Diameter of Outer Spring (in): 1.29 in. * Damper Spring Included: Yes * Number of Springs per Valve: Dual * Retainers Included: Yes * Retainer Material: Chromoly Steel * Locks Included: Yes * Lock Style: 7 Degree ROCKER ARMS: * Rocker Arm Studs Included: No * Rocker Arms Included: N/A * Rocker Arm Nut Thread Size (in): 8 x 1.25 * Rocker Arm Nuts Included: No MISC: * Head Style: Assembled * Cylinder Head Material: Aluminum * Cylinder Head Finish: Natural * Spark Plug Style: Standard * Cover Mounting Style: Standard * Steam Holes Drilled: No * Oiling Style: Through Pushrod * Machined for O-Ring: No * Heat Crossover: No * 10mm Accessory Bolt Holes Machined On Ends of Heads

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Trick Flow® GenX® 280 Cylinder Heads for GM LS3

Not Yet Reviewed

AFR 260cc LS3 Mongoose Cylinder Heads

AFR 260cc LS3 Mongoose cylinder heads are 100 percent 5-axis, CNC-ported, and feature titanium retainers, A356 aluminum castings, and Pac Racing springs. These CARB certified heads require 4.000 in. or larger bore applications on up through 454 cu. in. engines operating at or below 7,000 rpm—and flow over 380 cfm at 0.700 in. lift and are designed primarily for street and strip applications. Other structural features include Air Flow Research's trademark 3/4 in. thick head deck, reinforced rocker stud bosses, and thick wall runners provide unparalleled durability. Use of AFR stud girdles and full roller rocker arms are required. When it comes to building power, start with these AFR 260cc LS3 Mongoose cylinder heads.

5.0 out of 5 stars ( 5 )

Chevrolet Performance LS3 Cylinder Heads

Fit any LS engine with Chevrolet Performance LS3 cylinder heads. Manufactured from aluminum alloy, these GM stock replacement heads are assembled with intake and exhaust valves, stem seals, retainers, springs, and locks. Great cylinder head airflow has always supplied the LS Series with exceptional performance. Retain that performance and save yourself time and worry by replacing your tired cylinder heads with Chevrolet Performance LS3 cylinder heads.

5.0 out of 5 stars ( 3 )

FLOTEK 276cc LS3 Cylinder Heads

FLOTEK 276cc LS3 cylinder heads feature as-cast high-flow intake runners that flow significantly better than the stock LS3 heads. The ports are in the stock location, so no special valvetrain parts or rocker arms are required. These heads are 15 degree, which is the same as the stock cylinder heads—no special pistons are required. They will work on any LS block that has a 4 in. bore or larger. FLOTEK 276cc LS3 cylinder heads combine high performance and high quality at a value price. Select from bare or assembled models.

3.0 out of 5 stars ( 2 )

AFR 238cc LS3 Enforcer Cylinder Heads

AFR's 238 LS3 Enforcer cylinder heads feature its Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners, and combustion chambers that allow for extremely accurate and repeatable port location/performance. They are the first Enforcer castings with 100 percent AFR design. With a smaller valve and port, these heads outflow your OE LS3 casting by up to 20 cfm at low lifts, offering greater performance potential. The budget-friendly heads are perfect for your OEM engine operating below 6300 rpm. They come fully assembled with the identical components found in AFR's higher end CNC-ported cylinder heads—such as PAC Racing springs, Viton® valve seals, machined bead valve locks (not stamped), hardened spring seats, and one-piece 8mm 21-4N/21-8N stainless steel valves. They're available without any parts for DIY gearheads. Sold as a single piece; two are required per engine.

Not Yet Reviewed

Howards Cams LS Series Direct Bolt-On Roller Rockers

Add some punch to your Chevy LS with these Howards Cams LS Series direct bolt-on roller rockers. These roller rockers are easy replacements for your stock LS rockers and feature plenty of advancements that help you make more power and get better throttle response. Howards designed these roller rockers to be direct bolt-on pieces, so there is no need to change pushrods, guideplates, rocker studs, or valve covers, and your engine bay can keep that sleeper, bone stock look. These rocker arms are constructed from aluminum and feature needle-bearing fulcrums and roller tips to decrease friction and increase performance. Howards Cams offers these LS Series bolt-on roller rockers in either stock ratio or a high-lift, 1.80 ratio, so you can choose which one best fits your goals.

4.67 out of 5 stars ( 3 )

ATK High Performance 260cc CNC Ported LS3 Aluminum Cylinder Heads

ATK offers select parts for your build, including cylinder heads. They use them in their engine combinations and are available to complete your LS engine or upgrade existing components. ATK High Performance 260cc LS3 CNC-ported cylinder head features: * A356 aluminum construction * Stainless steel intake and exhaust valves * Manganese Bronze valve guides * Viton® valve seal * Powder meatal valve seats * Titanium retainers * Spark plug dimensions: 14mm x .708 in. with tapered seat

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Trick Flow® GenX® 255 Cylinder Heads for GM LS3

Trick Flow engineers used the best features of OEM GM LS3 and LS7 cylinder heads, combined with their own race-winning engineering and technology, to create the GenX® 255—the ultimate ultimate square port LS cylinder head for 4.000" and larger bore engines. The heads feature fully CNC Competition Ported runners with a premium high resolution surface finish for maximum airflow and performance potential. Stock LS3 ports accommodate LS3-style intake manifolds and LS9/LSA blower assemblies. The valve angles have been changed from 15° to 12° to increase piston-to-valve clearance and allow the use of larger camshafts. The coolant holes through the head deck were redesigned to work with all LS head gasket and engine block combinations. GenX 255 heads are available with standard or 6-bolt per cylinder mounting patterns. Trick Flow GenX 255 cylinder heads are emissions-legal under CARB E.O. #D-747 for 2007-present GM vehicles with 6.2L engines. They are available fully assembled or as bare castings. Sold individually.

4.0 out of 5 stars ( 7 )

ATK High Performance 270cc CNC Ported LS3 Aluminum Cylinder Heads

ATK offers select parts for your build, including cylinder heads. They use them in their engine combinations and are available to complete your LS engine or upgrade existing components. ATK High Performance 270cc LS3 CNC-ported cylinder head features: * A356 aluminum construction * Stainless steel intake and exhaust valves * Manganese Bronze valve guides * Viton® valve seal * Powder meatal valve seats * Titanium retainers * Spark plug dimensions: 14mm x .708 in. with tapered seat

Not Yet Reviewed

Trick Flow® GenX® 255 HD Cylinder Heads for GM LS3

Trick Flow® GenX® 255 HD cylinder heads offer an unbeatable combination of performance and durability, making them the perfect upgrade for your high-performance GM LS3 engine build. Assembled with Manley Severe Duty stainless steel valves, these heavy-duty versions of the standard GenX® 255 heads can withstand the added heat, stress, and abuse dealt by big power adders. That makes them the ideal choice for engines using superchargers, turbochargers, or nitrous. GenX 255 HD cylinder heads have fully CNC-profiled combustion chambers and CNC Competition Ported square port runners with a premium high resolution surface finish that guarantees dimensional accuracy and balanced flow from port-to-port for maximum power potential. The valve angles have been modified from the stock 15° to 12° to increase piston-to-valve clearance and allow the use of larger camshafts. The coolant holes through the head decks were designed to ensure compatibility with all LS head gasket and engine block combinations. The 6-bolt-per-cylinder mounting pattern for GMPP LSX and other aftermarket blocks increases clamping force to prevent head gasket failure, cylinder distortion, and other issues that plague the factory 4-bolt design. Trick Flow® GenX® 255 HD heads have LS3 port locations to work with all LS3-style intake manifolds and LS9/LSA blower assemblies. They must be used on engines with 4.000" or larger bores. Cylinder heads are available fully assembled or as bare castings. Sold individually.

Not Yet Reviewed

Edelbrock Victor 11-Degree CNC LS3 6-Bolt Cylinder Heads

Edelbrock Victor CNC 11-degree 6-bolt LS3 cylinder heads are specifically designed for high-horsepower, naturally aspirated, and boosted applications. Utilizing the popular LS 6-bolt design, they are compatible with the GM LSX block and all aftermarket iron or aluminum 6-bolt per cylinder LS race blocks. The design offers increased clamping capacity over the standard factory 4-bolt configuration and greatly improves head gasket sealing, making them ideal for high-compression naturally aspirated engines and high-boost applications. Edelbrock Victor CNC heads are manufactured with premium materials and machined to the industry's tightest tolerances. They have an 11-degree valve angle, copper infiltrated powder metal valve seats, and fully CNC-machined ports for maximum airflow. The machined runners and chambers, along with the valve angle increase overall flow capability, while the revised water jacket design enhances thermal conductivity and tunability. Premium manganese bronze valve guides withstand long wear with emphasis placed on holding precision tolerances on valve seat concentricity, allowing the valves to seal securely, eliminating leak down and increasing cylinder pressure during engine operation. Finally, the .700 in. thick deck and reinforced rocker rails make these cylinder heads ideal for high-horsepower applications.

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BTR Delphi Gen V Hydraulic Roller Lifter Sets

BTR Delphi Gen V hydraulic roller lifter sets are designed for GM's Gen V (LT) and many Gen III/IV LS-series V8 engines to improve valvetrain reliability, particularly for performance builds or AFM/DOD conversions. These lifters are a high-quality upgrade from stock, offering greater durability and a roller wheel that rides on the camshaft, reducing friction and wear to allow for more aggressive camshaft profiles. Additional details: * A great service kit for your worn-out LT AFM lifter set on that AFM conversion * Lifters will also work with Gen III and Gen IV LS engines by using a .025 - .050 longer pushrod * Comes with BTR-exclusive handy soaking and storage trays * Hydraulic Roller Design: They feature a roller on their base that follows the camshaft lobe, reducing friction and wear compared to older flat-tappet designs. * Engine Compatibility: While branded as "Gen V," these are widely used in Gen III (LS1, LS6) and Gen IV (LS2, LS3) LS engines, as well as Gen V (LT) engines, often for performance builds or when deleting the Active Fuel Management (AFM)/DOD system. * High-Quality: Delphi lifters are considered a reliable and durable component, and the BTR version includes upgrades like a high-strength tool steel body and upgraded axle. * Installation Assistance: BTR's trays help with the necessary step of removing the stiff packing grease and soaking the lifters in oil before installation. * Benefits: -- Improved Durability: They offer increased strength and durability for high-performance applications -- Reduced Friction: The roller design minimizes wear on the valvetrain and camshaft -- Valvetrain Overhauls: They are ideal for cam swaps, top-end rebuilds, or replacing worn AFM/DOD lifters

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Chevrolet Performance Stock Replacement Non-DOD Camshafts

If you're looking for a cost-effective camshaft solution to delete that pesky DOD—Chevrolet Performance stock replacement non-DOD camshafts are the answer. They're designed to work with OEM valve springs/pushrods in the DOD-equipped Gen 4 trucks. These OEM camshafts are standard equipment on non-DOD 5.3L trucks. Since they come as a single-bolt style, new timing gear won't be necessary. Just swap cams and additional DOD delete parts (sold separately) and you're ready to roll! A fairly stock truck shouldn't require dyno tuning; however, the DOD system must be disabled in ECU for proper functionality. It is advised to consult with your tuner for more information. Order the model recommended for your year/make and engine application. Additional features include: * Hydraulic roller tappet cam * Single-bolt camshaft gear attachment * Computer-controlled compatible * This is the camshaft only (other components sold separately)

4.89 out of 5 stars ( 18 )

Summit Racing™ Billet LS Rocker Stands

Strengthen your valvetrain using Summit Racing™ billet LS rocker stands. Our bars are stouter than factory, and are precision-cut from billet aluminum, helping to limit flex and distortion. Get assistance with rocker arm control; choose a set of Summit Racing™ LS rocker stands for your valvetrain.

5.0 out of 5 stars ( 6 )

COMP Cams Short Travel XD Hydraulic Roller Lifters

COMP Cams short travel XD hydraulic roller lifters offer the advantages of both light pre-load and reduced oil volume, producing the most stable and highest-revving hydraulic lifter available. The XD versions feature heavy-duty tool steel pushrod seats. This adds strength and durability in extreme-duty applications, such as turbo drag cars and offshore powerboats. Certain engines respond better to a light lifter pre-load because it recovers more quickly from any bad harmonics in the valvetrain. Others work better with a heavy pre-load because oil volume is reduced under the plunger, which increases lifter stiffness. Now you have the best of both—with COMP Cams short travel XD hydraulic roller lifters. Order the model designed for your vehicle and engine application.

3.5 out of 5 stars ( 2 )

Kanter Valve Lifters

Kanter Auto focuses on precision-engineered valve lifter replacements, both hydraulic and solid, for vintage and classic cars, ensuring correct fitment and performance for older engines. As crucial components in an engine's valve train, the valve lifters purpose is to transfer motion from the camshaft lobe to the pushrods or rocker arms, ensuring valves open and close at the right time, with hydraulic types automatically adjusting for slack, while solid lifters offer performance but need manual adjustments. Restore proper engine function and performance for your classic vehicle with Kanter valve lifters.

Not Yet Reviewed

COMP Cams Stage 2 LST Master Camshaft Packages

COMP Cams Stage 2 LST Master camshaft packages for GM LS applications take the guesswork out of choosing the right valve train upgrade package for your specific engine and desired performance. The "Low Shock Technology" behind COMP Cams LST camshaft packages features lobe profiles designed to maximize horsepower, while improving stability at higher rpm. These profiles are also easier on the valve springs, enhancing durability and reducing load loss. By Spintron and dyno testing these new profiles with many combinations of valve train components, COMP Cams engineers have created valve train packages that are perfectly matched for maximum horsepower and dependability in all popular LS applications with varying modifications. Stage 2 LST kits commonly add 90+ hp, depending on application. Stage 2 LST Master camshaft packages include: * COMP Cams LST camshaft * Lifters * Timing gear set or phaser limiter (depending on application) * Pushrods * Valve springs * Retainers * Valve locks * Spring seats * Valve seats

5.0 out of 5 stars ( 1 )

PRW Rocker Arm Adjuster Screws

PRW rocker arm adjuster screws are designed to thread into your rocker arm. They are made of hardened steel and feature a black oxide finish for maximum durability. The screws can be adjusted to the pushrod by using the internal Allen head and the 12-point locknut.

3.71 out of 5 stars ( 7 )

BluePrint Engines Muscle Series Cylinder Heads

Welcome to a new class of high performance cylinder heads--BluePrint Muscle Series! These aluminum heads are assembled with the perfect match of components for outstanding, trouble-free performance. Plus, they give you more power behind the wheel and in your wallet! These all-cast heads are designed for hydraulic flat tappet and hydraulic roller cam engines with hefty intake runners, stainless steel valves, Viton® seals, and dual springs. BluePrint Engines stand in front of the class, offering both performance and cost-conscious enthusiasts a powerful alternative--Muscle Series cylinder heads.

4.55 out of 5 stars ( 89 )