'76 Eldorado compression test

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500, 472, 425, 368 Discussion, '76 Eldorado compression test in Cadillac Engine Discussion; considering buying a '76 Eldorado. I want to have a manual compression performed on each cylinder. However, I don't know ...
  1. #1
    jace is offline Cadillac Owners Member
    Join Date
    Jul 2004

    '76 Eldorado compression test

    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?

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  3. #2
    crazyliver is offline Cadillac Owners Member
    Join Date
    Mar 2004

    Re: '76 Eldorado compression test

    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.

  4. #3
    Angela Desmond is offline Cadillac Owners Fanatic
    Join Date
    Apr 2003
    new windsor new york

    Re: '76 Eldorado compression test

    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...

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