Healthy compression 305ci


Veteran Member
Dec 17, 2005
Monterey, Ca
Nothing at all. I'm doing some diagnostic work on my buddy's 91 camaro. Before I run a compression test I would like to know the right ratio. I imagine it's going to be low, it has like 100,000 miles on it. Without regular oil and maintenance stuff.


Veteran Member
Aug 14, 2002
Long Island, New York
If you are doing a compression test at least 90 psi is needed for combustion I believe but ya probably wanna be at least 120 or better with that kinda mileage. what seems to be the problem???

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