308 springs

[Robbie2734]

I'm getting my heads redone and need some information on these heads. I know the castings are a little thin and need to cut the spring pockets to get the spring pressure down a bit. What is the maximum I could get away with, the final seat pressure will be 140 closed and 320 open. How much cat I take off the spring pads safely. This is for a street motor (3:23 rear) that won't see much over 5500.

[rumblefish360]

IMO, I wouldn't worry to much about the spring pressure. Good question though. I'd like to know that one myself.

[Robbie2734]

Right now we have 177lbs on a closed valve, thats a tad high. I want to run my 273 rockers, I'm not sure how they will like that. By the way, this is a roller cammed motor.

[rumblefish360]

Ummmmmm, yea, a bit high. Pm one of the engine builders?