[BYprodriver]

Originally Posted by Quadcammer

those cam plugs typically pop out if too much sealant or carelessly applied sealant is used on the cam covers. It clogs either an oil or vacuum passage (can't remember) and those tend to pop out. Not sure if you've had your cam covers off but look into this.

If you've had an AOS failure, your intake is full of oil. I would pull off the throttle body and cross over tube and get as much out as you can with paper towels. Really get into the plenums.

Given the compression ratio of the motor, I think you'd see more like 180 or so, so one cyl at 200 is odd. 150ish for the rest is fine since the reading is dependent on the seal of the gauge to the cylinder, the strength of the battery, etc.

It is a tiny oil passage at the top of the head. When you pull the green plugs you should be able to see the end of a camshaft, they are tubular& sealed with a 1/4" expansion plug. Make sure that plug is intact. If that head oil passage way is blocked the pressure can blowout the cam plug. Edit, just realized Quadcammer already posted half of what I stated.