79 Bob Glidden Small Block Pro Stock

pittsburghracer said

Bunch of smart guys realized that and engine was just an air pump. If I remember right what was the cubic inch rule back then? 355 if I remember right and those engines did put out some rpm so they probably had some pretty crazy rod and piston ratios.

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It was based on CID and weight. The lighter the car, the smaller the CID.

They all tried to stay at the 331 CID range because that was the most favorable weight break. IIRC (not in the mood to do math) a 4 inch bore and a 3.25 crank is close to 331 CID.

Ok, I did the math and with that crank and a 4.020 bore is 331 CID.