Piston Valve Relief CC's
 

I need to know what the 4 valve reliefs displace on a stock piston, in cubic centimeters. The pistons are out of a 91, 302 HO. I have aftermarket pistons, Speed Pro does not list what the valve reliefs are in CC. I need this info to finsih calculating my compression ratio.

Thanks.

the valve reliefs on most pistons are 5 -7 cc's. total.

i think its hard to calculate the cc's on stock piston releifs because of the .030 dish in the center of it. 5-7 sounds pretty close, i've installed flat tops for a 306 that had releifs measuring 8 cc's and they were a little bit deeper than stock.