Just picked up a complete engine, block number is ECZ-C and heads have ECZ-G. In looking at charts they say compression could be 8.6. 9.0, 9.1 or 9.7. All show the same cc. How do I tell which? I haven't taken engine apart yet. Don't need a lot of parts sitting around since it is a future project.

Ol'ford nutCentral Iowa

56 Vic w/292 & 4 spd.