Valves & Valvetrain Parts
- COMP Cams®Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1676-16)Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1676-16) by COMP Cams®. Ultra Pro Magnum™ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums™, but they also take stud mount rocker...Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.$566.95
- COMP Cams®Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1631-16)Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1631-16) by COMP Cams®. Ultra Pro Magnum™ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums™, but they also take stud mount rocker...Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.$444.95
- COMP Cams®Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1630-16)Ultra Pro Magnum™ Stud Mount Roller Rocker Arm Set (1630-16) by COMP Cams®. Ultra Pro Magnum™ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums™, but they also take stud mount rocker...Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.$453.95
- COMP Cams®Ultra Pro Magnum™ Stud Mount Roller Self-Aligning Rocker Arm Set (1618-16)Ultra Pro Magnum™ Stud Mount Roller Self-Aligning Rocker Arm Set (1618-16) by COMP Cams®. Ultra Pro Magnum™ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums™, but they also take stud mount...Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.$444.95
- Genuine®1st Design Intake Rear Rocker Arm (14620-R71-A01)Intake Rear 1st Design Rocker Arm (14620-R71-A01) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium...Made with precision and quality in mindDesigned to meet your specific needs$160.50
- Genuine®Exhaust "A" Rocker Arm (14612-R70-A01)Exhaust "A" Rocker Arm (14612-R70-A01) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$88.60
- Genuine®Exhaust "B" Rocker Arm (14614-R70-A01)Exhaust "B" Rocker Arm (14614-R70-A01) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$88.60
- Genuine®Exhaust Front Outer Rocker Arm (14624-RN0-A00)Exhaust Front Outer Rocker Arm (14624-RN0-A00) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials...Made with precision and quality in mindDesigned to meet your specific needs$250.51
- Genuine®Exhaust Rocker Arm (14624-RAA-A00)Exhaust Rocker Arm (14624-RAA-A00) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$60.41
- Genuine®Exhaust Rocker Arm (8C3Z 6564-B)Exhaust Rocker Arm (8C3Z 6564-B) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$70.95
- Genuine®Exhaust Rocker Arm (3C3Z 6564-AB)Exhaust Rocker Arm (3C3Z 6564-AB) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$110.93
- Genuine®Exhaust Rocker Arm (12681275)Exhaust Rocker Arm (12681275) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$21.85
- Genuine®Exhaust Rocker Arm (1130501034)Exhaust Rocker Arm (1130501034) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$279.13
- Genuine®Front Intake Rocker Arm (14610-RDV-J00)Front Intake Rocker Arm (14610-RDV-J00) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$116.08
- Genuine®Intake Front Rocker Arm (14610-R70-A02)Intake Front Rocker Arm (14610-R70-A02) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$112.80
- Genuine®Intake Rocker Arm (11337631589)Intake Rocker Arm (11337631589) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$53.97
- Genuine®Intake Rocker Arm (14620-RAA-A00)Intake Rocker Arm (14620-RAA-A00) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$295.96
- Genuine®Intake Rocker Arm (12669878)Intake Rocker Arm (12669878) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$96.74
- Genuine®Intake Rocker Arm (3C3Z 6564-BB)Intake Rocker Arm (3C3Z 6564-BB) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$108.42
- Genuine®Intake Rocker Arm (8C3Z 6564-C)Intake Rocker Arm (8C3Z 6564-C) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$73.10
- Genuine®Rocker Arm (038109527AF)Rocker Arm by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using state-of-the-art...Made with precision and quality in mindDesigned to meet your specific needs$829.98
- Genuine®Rocker Arm (13257-W0300)Rocker Arm by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using state-of-the-art...Made with precision and quality in mindDesigned to meet your specific needs$164.14
- Genuine®Rocker Arm (3L3Z6564A)Rocker Arm (3L3Z6564A) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using state-of-the-art...Made with precision and quality in mindDesigned to meet your specific needs$30.23
- Genuine®Rocker Arm (13801-0P010)Rocker Arm (13801-0P010) by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...Made with precision and quality in mindDesigned to meet your specific needs$61.62
- SKP®Rocker Arm (SKMR1111)Rocker Arm by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$68.35
- SKP®Rocker Arm (SKMR1346)Rocker Arm (SKMR1346) by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$14.46
- SKP®Rocker Arm (SKMR1345)Rocker Arm (SKMR1345) by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$6.04
- SKP®Rocker Arm (SKMR903)Rocker Arm (SKMR903) by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$12.82
- SKP®Rocker Arm (SKMR1342)Rocker Arm (SKMR1342) by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$12.77
- SKP®Rocker Arm (SKMR1351)Rocker Arm (SKMR1351) by SKP®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an...Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards$14.79
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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