Valves & Valvetrain Parts
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- Newco®Valve Adjuster NutValve Adjuster Nut by Newco®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for a...Made with precision and quality in mindDesigned to meet your specific needs$0.96 - $1.09
- PRW®PQX 2024 Extruded Rocker ArmPQX 2024 Extruded Rocker Arm by PRW®. Designed utilizing the latest technology, this product by PRW features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Made with precision and quality in mindDesigned to meet your specific needs$289.87 - $305.87
- PRW®Platinum Series PQx™ Shaft Mount Rocker Arm SystemPlatinum Series PQx™ Shaft Mount Rocker Arm System by PRW®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$53.66 - $663.64
- PRW®Pro Series Rocker ArmPro Series Rocker Arm by PRW®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for a...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$24.87 - $351.87
- PRW®Pushrod GuideplatesPushrod Guideplates by PRW®. PRW Pushrod Guide Plates are heat-treated steel alloy and a must have for todays high performance engines. Guide plates reduce the unwanted sideways motion of the pushrod under load. This keeps the rocker...Made from heat-treated steel alloyBlack oxide coated to resist corrosion$22.80 - $49.00
- PRW®Rocker ArmRocker Arm by PRW®. Performance Quotient Rocker Arm Studs are specifically designed to withstand the rigorous demands of todays high performance engines.PQx Series Rocker Arm Studs, ROCKERLOCS and other fasteners are cold formed from...Lightweight designPRW RockerLocs included$23.64 - $370.70
- PRW®Shaft Rocker System Complete KitShaft Rocker System Complete Kit by PRW®. Designed utilizing the latest technology, this product by PRW Industries features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Assorted shims for a quality installationAvailable for small block or big block applications$475.28 - $973.49
- PRW®Sportsman Series Rocker ArmSportsman Series Rocker Arm by PRW®. Designed utilizing the latest technology, this product by PRW features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Made with precision and quality in mindDesigned to meet your specific needs$15.34 - $343.87
- PRW®Stud GirdleStud Girdle by PRW®. Designed utilizing the latest technology, this product by PRW Industries features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...CNC machinedReduces rocker stud flex$149.20 - $239.60
- Payen®Valve Stem Oil SealValve Stem Oil Seal by Payen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$6.18 - $6.72
- Rocker Arms Unlimited®Re-Build Rocker Arm AssemblyRe-Build Rocker Arm Assembly by Rocker Arms Unlimited®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$269.09 - $341.86
- TRW®Rocker ArmRocker Arm by TRW®. Increasing torque and performance with decreasing consumption and emissions. The development goals in engine construction determine the requirements of modern gasket systems. As a leader in technology, an original...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$12.68 - $13.95
- TRW®Valve GuideValve Guide by TRW®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading materials using...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$8.06 - $12.34
- TRW®Valve Spring Retainer KeeperValve Spring Retainer Keeper by TRW®. Increasing torque and performance with decreasing consumption and emissions. The development goals in engine construction determine the requirements of modern gasket systems. As a leader in...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$0.44 - $3.65
- ACDelco®GM Genuine Parts Engine Connecting RodGM Genuine Parts Engine Connecting Rod by ACDelco®. Connecting Rod. GM Genuine Parts Engine Connecting Rods are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE...Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors$49.26 - $472.32
- ACDelco®GM Genuine Parts™ Engine Valve Lifter Control ValveGM Genuine Parts™ Engine Valve Lifter Control Valve by ACDelco®. GM Genuine Parts Engine Valve Lifter Control Valves are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are...Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors$23.66
- Mopar®Exhaust Valve SpringExhaust Valve Spring by Mopar®. Want your prized possession to look and perform the way it was designed to? Then top-of-the-line Mopar automotive parts and accessories are for you. Made using the latest manufacturing technology to meet...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$29.19
- ITM Engine®Engine ValveEngine Valve by ITM Engine®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$3.44 - $78.72
- ACDelco®Genuine GM Parts™ Rocker ArmGenuine GM Parts™ Rocker Arm by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$4.22 - $76.65
- ACDelco®Genuine GM Parts™ Rocker Arm Shaft SupportGenuine GM Parts™ Rocker Arm Shaft Support by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$28.49 - $53.96
- ACDelco®Genuine GM Parts™ Push RodGenuine GM Parts™ Push Rod by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$5.47 - $21.28
- ACDelco®Genuine GM Parts™ Rocker Arm RetainerGenuine GM Parts™ Rocker Arm Retainer by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$3.60
- ACDelco®Genuine GM Parts™ Engine Valve Spring ShimGenuine GM Parts™ Engine Valve Spring Shim by ACDelco®. Designed utilizing the latest technology, this Camshaft Position Sensor Interrupter by ACDelco features premium quality and will perform better than advertised. Perfect for your...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$3.84
- ACDelco®Genuine GM Parts™ Push Rod Guide PlateGenuine GM Parts™ Push Rod Guide Plate by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$6.71 - $21.11
- ACDelco®Genuine GM Parts™ Rocker Arm BallGenuine GM Parts™ Rocker Arm Ball by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.71
- ACDelco®Genuine GM Parts™ Valve Lash CapGenuine GM Parts™ Valve Lash Cap by ACDelco®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$6.30 - $25.92
- Mopar®Engine Valve SeatEngine Valve Seat by Mopar®. Want your prized possession to look and perform the way it was designed to? Then top-of-the-line Mopar automotive parts and accessories are for you. Made using the latest manufacturing technology to meet the...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$7.82 - $30.31
- Mopar®Engine Valve Spring SeatEngine Valve Spring Seat by Mopar®. Want your prized possession to look and perform the way it was designed to? Then top-of-the-line Mopar automotive parts and accessories are for you. Made using the latest manufacturing technology to...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$1.86 - $20.55
- ITM Engine®Rocker Arm ShaftRocker Arm Shaft by ITM Engine®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$22.46 - $79.55
- Elring®Engine Push Rod Tube SealEngine Push Rod Tube Seal by Elring®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$0.61 - $0.67
Valves allow gases to flow in and out of the cylinders, and seal the combustion chambers so compression can develop. They open and close in response to the lobes on the camshaft via the valvetrain. The air/fuel mixture flows in when the intake valve opens, and the spent exhaust gases flow out when the exhaust valve opens after the power stroke. Every engine has at least one intake and exhaust valve, while many have a pair of each.
Valvetrains differ according to camshaft location. On Over Head Valve engines the cam is in the cylinder block. On Over Head Cam engines one or two cams are on the cylinder head. On OHV engines lifters ride on the camshaft lobes, pushrods transfer motion up to the cylinder head, and rocker arms pivot on shafts or studs actuating the valves. OHC valvetrains may have pivoting rocker type followers and lash adjusters or buckets between the cam and valves.
Valvetrain problems are often caused by excessive clearance. As cam lobes, lifters/followers, pushrods, and rocker arms wear, clearance is increased. Once clearance starts to increase, the pounding experienced by each component becomes greater as the lash opens and is taken up during valve operation. This can result in bent pushrods and broken rocker arms. The most common valve failure is overheating, especially on exhaust valves, which causes the valve to “burn” and distort and/or crack.
Miles and engine heat can also take their toll on valve springs. The valve springs must have enough pressure to keep the valves closed and maintain valve lash. Seat pressure is usually 70-90 lbs. on a stock engine with open pressure at 200 lbs. or more. Weak valve springs can’t exert the proper amount of pressure, which can cause misfire and loss of power as engine speed increases, resulting in “valve float”, where the valves fail to close. In extreme cases valve float can allow the valves to contact the pistons on some engines, bending or breaking the valves and cracking or breaking the pistons.
Performance valvetrain components must be much stronger to function at high RPMs and overcome stiff valve spring pressure to open larger valves. Higher valve spring pressure is needed to prevent valve float at high RPM. Performance rocker arms and valve spring retainers are made of lighter materials to enable the engine to rev easier and achieve higher RPM, and components like roller lifters and roller rockers reduce power-robbing friction. Most performance pushrods are made of strong chrome moly steel, and larger diameter pushrods are available for some applications. No matter whether you’re looking for a stock replacement or a performance unit, we are your one-stop shop.
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