Valves & Valvetrain Parts
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- ITM Engine®Rear Intake Rocker Arm (056-6156)Rear Intake Rocker Arm (056-6156) 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...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$52.02
- ITM Engine®Rocker Arm (056-6012)Rocker Arm 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 materials...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$12.56
- ITM Engine®Rocker Arm (056-6111)Rocker Arm (056-6111) 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...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$16.23
- ITM Engine®Rocker Arm (056-6143)Rocker Arm 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 materials...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$11.82
- ITM Engine®Rocker Arm (056-6087)Rocker Arm (056-6087) 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...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$29.17
- ITM Engine®Rocker Arm (056-6086)Rocker Arm (056-6086) 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...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$27.94
- ITM Engine®Rocker Arm (056-6214)Rocker Arm (056-6214) 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...Designed with innovative manufacturing techniquesMade with maximum safety and reliability in mind$21.44
- DNJ Engine Components®Rocker Arm (RA1100)Rocker Arm by DNJ Engine Components®. 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...Designed to replace your malfunctioning partsHelps get your vehicle back to it's original performance$10.08
- DNJ Engine Components®Rocker Arm (RA1169)Rocker Arm by DNJ Engine Components®. 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...Designed to replace your malfunctioning partsHelps get your vehicle back to it's original performance$11.95
- DNJ Engine Components®Rocker Arm (RA314)Rocker Arm (RA314) by DNJ Engine Components®. 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...Designed to replace your malfunctioning partsHelps get your vehicle back to it's original performance$10.51
- Crown®Rocker Arm (5184296AH)Rocker Arm (5184296AH) by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!Developed to improve your driving experienceConstructed to ensure ultimate operation$24.36
- Crane Cams®Roller Rocker Arm Kit (11802)Roller Rocker Arm Kit (11802) by Crane Cams®. High-performance engine builders and street tuners who crave for maximum performance out of their vehicle, choose these top-grade performance products painstakingly designed by Crane Cams....Designed to unlock more performance out of your vehicleBump up engine power to the next level$8.54
- Elgin®Rocker Arm (R849)Rocker Arm by Elgin®. 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 hassle...Stamped steel design for high-performanceSuperior heat treat$10.30
- Elgin®Rocker Arms (R805)Rocker Arms by Elgin®. 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 hassle...Stamped steel design for high-performanceSuperior heat treat$18.35
- INA®Exhaust Rocker Arm (VF0076)Exhaust Rocker Arm (VF0076) by INA®. 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...Made from sturdy materialsGreat design and function$8.18
- INA®Exhaust Rocker Arm (4230076100)Exhaust Rocker Arm (4230076100) by INA®. 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...Made from sturdy materialsGreat design and function$12.00
- INA®Rocker Arm (VR0059)Rocker Arm (VR0059) by INA®. 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 from sturdy materialsGreat design and function$7.78
- INA®Rocker Arm (VR0058)Rocker Arm (VR0058) by INA®. 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 from sturdy materialsGreat design and function$7.78
- INA®Rocker Arm (4220251100)Rocker Arm by INA®. 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 hassle free...Made from sturdy materialsGreat design and function$7.28
- PRW®Rectangular Port Heads Rocker Arm Kit with Bronze-Bushed Trunnion (0637619)Rectangular Port Heads Rocker Arm Kit with Bronze-Bushed Trunnion (0637619) 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...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$309.87
- PRW®Rectangular Port Heads Rocker Arm Kit with Needle Bearing Trunnions (0637617)Rectangular Port Heads Rocker Arm Kit with Needle Bearing Trunnions (0637617) 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...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$309.87
- TRW®Rocker Arm (50006171)Rocker Arm (50006171) 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...Made with precision and quality in mindDesigned to meet your specific needs$12.68
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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