Quote:
Originally Posted by 66sprint6
The engine in our '67 LeMans is a 400 from a 1974 Pontiac. Recently, I had an issue with a rocker arm coming off the stud and the exhaust valve stayed closed. Scared the heck out of me when the engine started running like crap.
I noticed that the pushrod has some scarring now and I was thinking of just replacing them all. But I see two different dimensions: 7.794 and 9.136. I know that I can pull the valve cover and pull one out but I just wanted to see if anyone knows off the top of their head which one is correct.
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What is the casting number on your heads?
1967 heads w/guideplates 2:nd design) takes the 9.145" lenght pushrod and the longer rocker than the 1967 heads (1:st design) not using guideplates.