Originally Posted by TonkaYJ
I have a mid 70s Chev. 454 Flat top piston, .030 over, stock steel crank,stock rods block decked .005 heads shaved .005 cyl. head # 353049
Please tell me how much compression this motor has thanks in advance! I am trying to pick a cam
Assuming 3 cc's in the piston, 943 cc's in the cylinder, 122 cc's in the chambers, 4.7 cc's in the piston deck height (piston down in the bore 0.020") and using a 10 cc gasket, the total ingested with the intake valve open is 1082.7 cc's. With the piston at TDC, the volume is 139.7 cc's. Dividing the larger by the smaller will yield 7.75:1 static compression ratio. This is a plow horse, not a race horse. Don't ruin it by installing a race cam. I wouldn't use over 200 degrees duration @ 0.050" tappet lift.
If you want more, either change the heads or change the pistons or change both.