Does anybody know about what my compression ratio would be for a stock 75 455 short block and 69 big port heads. Lets just say this is without milling anything.
70 pistons (25cc) with your 69 heads (68cc) would be 10 to 1, a 75 block with 75 piston (42cc) with your 69 heads would be about 8 to 1. A stock 75 moter has 78cc heads and its commpression is about 7 to 1.
