Those old gm sixes are killer. And I remember my dads friend had one of the v12’s I got to see in person although I was pretty young. 4 heads, 4 valve covers and dual distributors those things were wild!
Pull the valve cover and shake/twist all the rockers while they should be under a load. If one isn’t just blatantly loose you can use a dial indicator to measure net lift and make sure there all in spec
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.