Quote Originally Posted by techinspector1
With 4.155" bore, 3.750" stroke, 76 cc heads, 12 cc's in the piston and 9 cc's in the gasket bore (4.200" x 0.039" Fel-Pro 1014) and the piston zero decked, static compression ratio will be 9.58:1 with a squish of 0.039".
Using a cam with an intake closing point of 35* ABDC will yield a dynamic compression ratio of 8.4 on the KB calculator, which is probably about the limit for pump gas. Here's an example of a dual pattern cam with that spec. It's ground on 112* centers, but you could have it ground on alternate centers to give you some rump rump if you wish, just as long as you keep the intake closing point at about the same place. I'm not saying use this cam, I'm just giving you an example of cam timing that should work.
http://www.cranecams.com/?show=brows...tType=camshaft
One thing to remember in a 400 sbc the cam will act like it is smaller by 300-400 rpm's depending on how you have it installed.