You might have broke a ring. Better pull that top end apart before something real bad happens. I think I had around 175 psi on my top end, but I could be wrong(its been a few months since it was checked). I dont think rings will cause the combustion to break up, as the engine should run with less power. I had my motor break up bad last spring while racing a predaturd, come to find out my fuel filter was partially clogged and couldnt flow enough for extended WOT. Something else to check. Good luck.
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1987 Quadzilla
FMF Fatty pipe
.060 overbore
Milled head
Ported cylinder
Wiseco piston
Pwk 39
Tudors 12 petal reed valve
Sidewinder Ti moly sprockets and chain
Front and rear Razrs
Renthal bars
and much more to come.
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