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Are you saying what you've seen is the driver's side bore failures tend to occur on the major thrust side, but the passenger side failures are on the minor thrust side?

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If that is what thier called, yes It is what it was I may have seen one 400 block split the passenger side cylinder split the outside (block side) CRS The same 400 block split the number two cylinder and had the #4 main cap broken after the same race (half filled) That racer was running it in S/G on a low budget, probally got the motor into detonation