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H2Xmark

11-25-2002 07:39 PM

compression reading on 454mag

How much compression would a stock 1997 454 mag mpi have on a gauge, I know they all need to be within about 7% of each other, but what would a stock reading be? should it be over 150?

Raypanic

11-25-2002 07:50 PM

I believe 140-145 is "normal". A leak down test is more accurate.

obnoxus

11-25-2002 07:51 PM

Merc manual says 150 psi, I would be happy above 140 psi

H2Xmark

11-25-2002 09:25 PM

Thanks for the reply, a leak down test is best, but this is better than nothing
Mark

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