gm280
Supreme Mariner
- Joined
- Jun 26, 2011
- Messages
- 14,605
Buy a good one from a reputable auto parts dealer and you will get the correct readings. And I'll bet it is higher then you think. No way an engine can run great with lots of power and have a 50psi compression ratio unless it is a specially ported timed racing setup. But then it wouldn't idle correctly either. JMHO!