[Hozer 88GTConv]

I am fouling number 5 plug almost instantly.

I have r/r the heads. Replaced valve seals twice. The guides are good. All other cylinders/plugs are perfect. I did a comp check and I thought it was fine. No discernable difference in PSI in any of the cylinders and all were within 10 percent, dry and wet.

I am totally frustrated. I am travelling with the car but can do some maintenance.

Anybody have any tricks to isolate this? I go through a quart of oil in a week. The plug fouls right away. With that much oil, I'd think the psi would be crap with bad rings but it seems good.

Thanks in advance.