383 vs 400

ASSUMING 88 cc's for the heads and a .040" compressed head gasket that puts the CR at 7.85:1. A steel shim .020" head gasket would put it at 8.14:1. This engine was a 2-brl but that still seems low. Especially since the heads may be closer to 90 cc's.

It's a real crap shoot, almost all the original motors I've torn into were at least 1/2 point low on compression. 2 383 hp motors were the exceptions. I think I just got lucky though on those. Production tolerances were pretty bad on some stuff. Dave

This is regarding 383 engines so it's something to consider and this was pulled from a Moparts thread in regards to someone who did a check on their 69 383 engine.