$3500 Down the road from me

[spareparts]

Ferm, I haven't seen any OMC loopers with that much compression, I know on the mercs we mill the heads to get 140 psi, anything above 145 we start running race gas or octane booster, on the 3.0l mercs, 135 is about max before the expensive gas, most of the OMC loopers I mess with show around 120, could just be my gauge or it could be the thick head gaskets

[THEFERMANATOR]

I know mine is 155 on 3 differrent guages, and I've checked a few other 140 LOOPERS and they all checked out at 135-145 on my guage. The V-4 90 degree loopers don't have idle reliefs like teh V-6's have, so they have alot higher compression than there bigger counterparts. I know the 94+ V-6's get 110-120, but the V-4 should be a bit higher. Mine ran at 110, but I never could get it to idle right until I rebuilt it and got my compression back up to 140(then I opened it back up and ported it a bit and decked teh heads and got it up to 155, still ran great on 87 octane gas though at 19 degrees of timing).