Valves & Valvetrain Parts
- Pioneer Automotive®Engine Rocker Arm StudEngine Rocker Arm Stud by Pioneer Automotive®. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.61 - $92.85
- COMP Cams®Hi-Tech™ Rocker Arm StudHi-Tech™ Rocker Arm Stud by COMP Cams®. This high-grade product was designed with craftsmanship and key attention to detail and manufactured using leading-edge innovations by experienced and knowledgeable engineering staff. It ensures...Developed to provide steady performance and reliabilityMade using up-to-date equipment and new technologies$12.95 - $129.95
- ARP®Rocker Arm Stud KitRocker Arm Stud Kit by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly. You’ll note...Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$10.72 - $150.42
- Pioneer Automotive®3/8" Rocker Arm Stud (S-1000)3/8" Rocker Arm Stud (S-1000) by Pioneer Automotive®. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle,...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$38.45
- Pioneer Automotive®3/8" Rocker Arm Stud (850008)3/8" Rocker Arm Stud (850008) by Pioneer Automotive®. With Rockers. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$49.54
- Pioneer Automotive®7/16" Rocker Arm Stud (850010)7/16" Rocker Arm Stud (850010) by Pioneer Automotive®. With Rockers. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$38.95
- Pioneer Automotive®7/16"x3/8" Rocker Arm Stud (850013)7/16"x3/8" Rocker Arm Stud (850013) by Pioneer Automotive®. 2500 O.A.L. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$26.96
- Pioneer Automotive®7/16"x3/8" Rocker Arm Stud (850001)7/16"x3/8" Rocker Arm Stud (850001) by Pioneer Automotive®. Without Jam Nut. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$16.82
- Pioneer Automotive®7/16"x7/16" Rocker Arm Stud (850014)7/16"x7/16" Rocker Arm Stud (850014) by Pioneer Automotive®. 2650 O.A.L. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$47.27
- COMP Cams®Hi-Tech™ Race Rocker Arm Stud Set (4514-16)Hi-Tech™ Race Rocker Arm Stud Set (4514-16) by COMP Cams®. This high-grade product was designed with craftsmanship and key attention to detail and manufactured using leading-edge innovations by experienced and knowledgeable...Developed to provide steady performance and reliabilityMade using up-to-date equipment and new technologies$112.95
- ARP®Pro Series Rocker Arm Stud Kit (234-7208)Pro Series Rocker Arm Stud Kit by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly....Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$131.85
- ARP®Rocker Arm Stud Kit (100-7221)Rocker Arm Stud Kit (100-7221) by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly....Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$12.21
- ARP®Rocker Arm Stud Kit (290-7201)Rocker Arm Stud Kit by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly. You’ll note...Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$122.02
- ARP®Rocker Arm Stud Kit (135-7201)Rocker Arm Stud Kit (135-7201) by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly....Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$112.49
- ARP®Rocker Arm Stud Kit (135-7102)Rocker Arm Stud Kit (135-7102) by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly....Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$80.34
- ARP®Rocker Arm Stud Kit (134-7201)Rocker Arm Stud Kit by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly. You’ll note...Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$112.49
- ARP®Rocker Arm Stud Kit (100-7201)Rocker Arm Stud Kit (100-7201) by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it properly....Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$66.07
- Enginetech®Rocker Arm StudRocker Arm Stud by Enginetech®. 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$46.16 - $61.25
- COMP Cams®Rocker Stud And Trunion Retro-FitRocker Stud And Trunion Retro-Fit by COMP Cams®. This high-grade product was designed with craftsmanship and key attention to detail and manufactured using leading-edge innovations by experienced and knowledgeable engineering staff. It...Developed to provide steady performance and reliabilityMade using up-to-date equipment and new technologies$516.95
- Isky Racing Cams®Rocker StudsRocker Studs by Isky Racing Cams®. 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 maximize horsepower and torque of your vehicleMade with meticulous attention to detail and unmatched craftsmanship$172.83 - $175.93
- Lunati®Rocker Arm StudRocker Arm Stud by Lunati®. Get some serious horsepower with an outlaw attitude by upgrading to this performance engine part from Lunati. Built with a rich heritage of precision engineering and innovation, this high-value Lunati product...Designed to beef up power and performanceBuilt by hardcore racers for hardcore racers$7.63 - $221.53
- Mr. Gasket®Rocker Arm Stud Pinning KitRocker Arm Stud Pinning Kit by Mr. Gasket®. Designed with hardcore racing junkies and high-speed street enthusiasts, this Mr. Gasket performance product is right what you need to boost your driving experience. Crafted with cutting-edge...Designed to help you make the max out of your ridePerfect upgrade for race cars and muscle cars alike$59.95 - $85.95
- SBI®Rocker Arm StudRocker Arm Stud by SBI®. 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...Made with precision and quality in mindDesigned to meet your specific needs$2.85 - $2.90
- Enginetech®Rocker Arm Studs (100-7101)Rocker Arm Studs (100-7101) by Enginetech®. 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 deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$46.16
- Enginetech®Rocker Arm Studs (134-7104)Rocker Arm Studs (134-7104) by Enginetech®. 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 deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$51.29
- Enginetech®Rocker Arm Studs (135-7101)Rocker Arm Studs by Enginetech®. 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...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$61.25
- Enginetech®Rocker Arm Studs (134-7101)Rocker Arm Studs (134-7101) by Enginetech®. 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 deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$51.58
- Pioneer Automotive®5/16" Rocker Arm Stud (850009)5/16" Rocker Arm Stud (850009) by Pioneer Automotive®. With Rockers. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$41.22
- Pioneer Automotive®7/16" Rocker Arm Stud (850022)7/16" Rocker Arm Stud (850022) by Pioneer Automotive®. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.61
- Pioneer Automotive®7/16" Screw-in Rocker Arm Stud (S-1001)7/16" Screw-in Rocker Arm Stud (S-1001) by Pioneer Automotive®. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$36.51
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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