considering buying a '76 Eldorado. I want to have a manual compression performed on each cylinder. However, I don't know what the standard compression psi is for the 500cu in. (8.5:1 compression ratio) engine. Is the standard amount of psi 140-160psi?
07-02-04, 05:33 AM
I can't answer your question directly, but when you are checking any motor for compression, look for consistency. They should all be within 10% of each other, any more than that variance there is likely a problem.
07-02-04, 09:53 AM
120PSI should about do it for your motors top compression readings.Above 90 and it should still be sound. Below that and I'd start to wonder...