snowy1
TY 4 Stroke Guru
thier repair should handle anything the stock ones would handle, any signs of tetonation, what fuel where you running, what compression and elevation, I would call them and see what they have to say, seems strange all four cylinders did the same thing, usually if its a fuel problem its one or two cylinders and signs of teto.
wantboost
Expert
i don't think this would cause cracks in the cylinder but i do think it would cause lack of oil at the crankshaft main and connecting rod bearings.