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72 Compression test

Roscoe95

New Member
Joined
Jan 23, 2016
Messages
42
Just ran a compression test on my 72 302. made one error in not warming up first but had 120-125 on all eight. Would i expect to see higher results after warming?
 

DirtDonk

Contributor
Bronco Guru
Joined
Nov 3, 2003
Messages
51,622
Probably not.
Not that warming isn't desired for best sealing, but those numbers actually look like what I would expect from a '72 if it's still all stock.
If it's been rebuilt, modified or a different cam has been installed, then you could get higher/lower numbers, but again, 120-ish is what I would have expected.

Very tight numbers actually. Looks good.
And yes, I know it's a big fat pain in the butt to do it again, but if you want to be sure, warm it up and re-test.
Did you also hold the carburetor/throttle body blade(s) all the way open during the test?

Paul
 
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