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The X51 engine is no different on the bottom end. It is a series of top end modifications, heads, cams and intake, porting etc. Bottom end uses the same parts as the regular 3.6.
While the M96 motors have some issues, personally I don't see this failure as one of them. The 964 based motors have seen crank failures at the track with their true drop forged cranks. To me this is an issue of running a street motor on the track at sustained high rpm for over 12k miles without tear down and inspection or balancing of reciprocating masses.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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Threaded Mode
