As cam profiles continue to get more aggressive and valve springs pressure
increase, the importance of pushrod knowledge has never been more critical. Here
are some answers to the most common questions that you might have for COMP Cams®
tech support about pushrods.
Pushrod Length & Rocker Arm Geometry
A large number of variables are involved in determining the correct length
pushrod for your application. Pushrod length is affected by any of the
• Block deck height
Don’t assume anything when determining the right pushrod for your new engine. A
pushrod that fits one engine may not necessarily work in another. Any number of
items can be different on your engine, requiring you to use a different pushrod
length. Following the steps below will streamline the pushrod selection process,
ensuring that you get the right parts the first time.
• Head deck height
• Head stud boss height
• Rocker arm brand/design
• Cam base circle size
• Lifter design/brand/pushrod seat height
• Valve stem length
1. Buy a checking pushrod.
Do not buy pushrods when you buy the cam, lifters and other valve train
components. As much as we would like to sell you pushrods at this time, nobody
can predict ahead of time what length a given engine needs, unless it is bone
Instead, invest in a