I am taking a set of ported 430 heads to the local machine shop. I will be installing a set of 1:65 roller rockers from TA so I need the push rod holes enlarged, but need to know what size to tell him to enlarge them to. I believe 1/2" holes is what I need. Is this correct? Also, what is the proper valve height? My valves are new stainless Stage 1's. I will be running a TA 413 cam and need to know the proper spring psi to set them at. What would that be. Just want to have proper info. This guy along with everyone else here is a Cheby expert and that is all he knows.
John Since you are using his cam and hopefully his bearings call Mike T. at TA Performance. They are on mountain time.
