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0 comp sounds like it's done
My piston with a brutal hole in the ring lands read 0, cyl 3 had the same thing but not quite as bad and I got 50psi (you can see said motor in my build thread)
Valve issues?
Unless it's something retarded like the chain broke but I have never seen that, not saying it can't happen but I've never seen it.
If I saw 0 comp I'd pull the motor out. Or if you wanna pull the head if a borescope is not available.
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