Compression check...

[Hozer 88GTConv]

Okay, I've had it.

Number 5 holds steady for over an hour with 175 psi dry.
All others are between 165 and 180. To me, that's good. Certainly not bad enough to explain my oil loss. So where then?

I am consuming one quart of oil every 200 miles and fouling number 5 totally within a few minutes of operation. I've changed valve seals twice, checked valve seats when I r/r'd the heads a month ago, and the intake manifold gaskets have been changed 5 times. It NEVER smokes.

The plug in number 5 is soaked on all the threads and the electrode tip. Even fouls a plug two heat ranges hotter.

This is pissing me off. Oil ring? Would it hold pressure that long with a bad oil ring?

I'm thinking of swapping intakes, b/c the valves have a lot of oil on 'em and the plug condition still makes me think it's coming from "up top"...

I am days away from pulling my engine if I can't figure this out (again). I've pulled the heads twice now in three months.