Valves & Valvetrain Parts
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- 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®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
- 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
- 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™ Exhaust Rocker Arm (12636190)Genuine GM Parts™ Exhaust Rocker Arm (12636190) 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...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$18.52
- ACDelco®Genuine GM Parts™ Intake Rocker Arm (12579615)Genuine GM Parts™ Intake Rocker Arm (12579615) 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$17.53
- ACDelco®Genuine GM Parts™ Intake Rocker Arm (12636189)Genuine GM Parts™ Intake Rocker Arm (12636189) 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$18.52
- ACDelco®Genuine GM Parts™ Rocker Arm (12656486)Genuine GM Parts™ Rocker Arm (12656486) 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$24.38
- ACDelco®Genuine GM Parts™ Rocker Arm (24503999)Genuine GM Parts™ Rocker Arm (24503999) 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$35.59
- ACDelco®Genuine GM Parts™ Rocker Arm (12669878)Genuine GM Parts™ Rocker Arm (12669878) 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$76.65
- ACDelco®Genuine GM Parts™ Rocker Arm (09129211)Genuine GM Parts™ Rocker Arm (09129211) 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$6.50
- ACDelco®Genuine GM Parts™ Rocker Arm (12577695)Genuine GM Parts™ Rocker Arm (12577695) 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$27.54
- ACDelco®Genuine GM Parts™ Rocker Arm (12556298)Genuine GM Parts™ Rocker Arm (12556298) 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$29.47
- ACDelco®Genuine GM Parts™ Rocker Arm (23500074)Genuine GM Parts™ Rocker Arm (23500074) 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$21.89
- ACDelco®Genuine GM Parts™ Rocker Arm (12666601)Genuine GM Parts™ Rocker Arm (12666601) 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$40.85
- ACDelco®Genuine GM Parts™ Rocker Arm (12619829)Genuine GM Parts™ Rocker Arm (12619829) 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$17.41
- ACDelco®Genuine GM Parts™ Rocker Arm (12681275)Genuine GM Parts™ Rocker Arm (12681275) 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$15.93
- ACDelco®Genuine GM Parts™ Rocker Arm (12599650)Genuine GM Parts™ Rocker Arm (12599650) 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$56.77
- ACDelco®Genuine GM Parts™ Rocker Arm (24100294)Genuine GM Parts™ Rocker Arm (24100294) 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$7.03
- ACDelco®Genuine GM Parts™ Rocker Arm Kit (12510801)Genuine GM Parts™ Rocker Arm Kit (12510801) 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$15.85
- ACDelco®Genuine GM Parts™ Rocker Arm Kit (10089648)Genuine GM Parts™ Rocker Arm Kit (10089648) 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$29.39
- ACDelco®Intake Rocker Arm (W0133-4137325-ACD)Genuine GM Parts™ Intake Rocker Arm (W0133-4137325-ACD) 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...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$30.52
- Mopar®Exhaust Rocker Arm (04781182AA)Exhaust Rocker Arm (04781182AA) 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...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$110.60
- Mopar®Exhaust Rocker Arm (04663996)Exhaust Rocker Arm (04663996) 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...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$83.20
- Mopar®Exhaust Rocker Arm (MD178782)Exhaust Rocker Arm (MD178782) 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...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$34.14
- Mopar®Exhaust Rocker Arm (53021553AB)Exhaust Rocker Arm (53021553AB) 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...Ideal solution to keep your vehicle in top shapeCrafted from premium-grade materials and the latest technology$147.91
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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