How much valve spring pressure can a stock head (LT1) hold safely? Also if the heads have been substantually milled, 52cc combustion chambers, is the base too thin to spray the car hard, 200-250 shot?

 

As you can see... no responses. If it has "LT1" in the topic, its about 99.9% certain that it belongs in "LT1 Engine Tech". Moving it there.

 

If you're asking how much valve spring pressure you can run, it's not a matter of the head, it's going to be dependent on the type of lifter you use and the cam profile to dictate the proper springs pressures.

As far as the milling, can't help ya.