Quote:
Originally Posted by 209
Back to the installer for warranty work and he discovered #7 and 8 with verticle scoring in those two cylinders only.
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Scoring could have happened during assembly. It also could have happened by letting crap into the intake. I doesn't take all that much. A tiny hard partical getting between the cylinder and piston can scratch it up pretty bad.
Too much timing and detonation break a plug. Lot's of ways it could have happened.
In short it may not be Roush's fault at all.