What is the difference between stud mount and pedestal mount rockers?
Stud mount rockers are stronger than Pedestal Mount Rockers. They can be made even stronger by using a Stud Girdle. However, they are not as strong as Shaft Mount Rockers. Stud mount rockers can also make adjusting the valvetrain easier by using Polylocks.
What is a shaft rocker?
When building a race engine, a shaft-mount rocker system increases power and durability. Shaft rockers also reduce friction by reducing flex and increasing rocker arm radius. When the rocker stud flexes, the rocker arm tip moves a longer distance across the valve tip.
How do you measure pushrod length with shaft rockers?
Place an adjustable checking pushrod into the lifter and install one intake and one exhaust rocker arm assembly. Be sure the cam is rotated to the base circle. Insert a feeler gauge on the valve side of the rocker arm to set your desired lash. Use the adjustment on the pushrod to determine the correct pushrod length.
Do I need shaft mount rockers?
Shaft mounts are ideal for race engines that operate at high rpm (over 7,000). Shaft mount rockers make adjusting the valvetrain easy. They also require very little maintenance. If you are building a high-end race engine, we would recommend shaft mount rockers.
What do rocker arm stud girdles do?
A stud girdle clamps onto your engine’s rocker studs, essentially locking your rockers together to deliver the stability you need in a high-rpm performance engine. But it’s not as simple as just slapping a girdle under your valve covers.
What happens if pushrods are too long?
Excessive pushrod length can then eliminate the ability of the cylinder to build compression. Naturally, this can cause anything from poor performance to, in severe cases, the engine not to start or even run.
How do I know what pushrods I need?
If the pushrod is too short, the mark will be toward the intake (inboard) side of the valve tip. If the pushrod is too long, the travel will be toward the outboard or exhaust side of the valve tip. An ideal pushrod length will minimize the travel across the center of the valve tip.