Originally Posted By: Mitch
You are correct, at least that's what my machinist told me! In theory, you could check the 295 piston with no overbore and compare compression height to the 295 with .060 and see if it's different.

Does anyone know what the stock compression is on a 250? Going by a replacement piston with no dish or dome and my deck height, it would be around 8:1, as a guesstimate. 9:1 or more would be quite the improvement by itself.

Worse case scenario, I will still have more compression than factory which falls under my goal of updating the original engine. It'll be light years ahead of the 216/235 that was originally in it.


That's exactly the advertised static compression ratio for my '78 Camaro 250cid. I haven't cracked it open to check it yet.