I agree. Oil will always raise the number unless you have a wasted valve. Usual 5.0l compression numbers are around 160 psi.
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1988 Mustang GT
stock bottom 302, C4
10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN
1989 Mustang notchback
Warmed up 306 with a Procharger.
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