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Old 01-27-2000, 10:59 PM
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what is considered good compression for a 76 450 se. reading are 150,150,135,165 cylinder 1-4 and 150, 150 ,0 135 for 5-8. cylinder 7 had a badly burned exhaust valve and the head gasket was worn between 7 and 8. cylinder head work is being done to correct the burnt exhaust valved and replaced the head gasket.
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Old 01-28-2000, 05:06 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
The absolute pressure isn't as important as the differences between cylinders. 160-170 psi is a good place to be, but, the best of all worlds is a variation of less than 10% between cylinders. I don't know the spec for your motor, but most are in that ballpark...

Jeff L
1987 300e
1989 300e
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Old 01-28-2000, 06:36 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Compression readings are in direct relation to compression ratio. U.S. cars in that era had 8/1 ratio so about 140 lbs is a normal reading. W/stock cams that is!
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