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  1. Keesyman

    My New HMMWV

    Well GM quit making the 6.5L in 1999, Sold the blueprints and engine building line to AM General that started GEP, in Franklin, OH.. They made a whole engine plant to start casting and creating the 6500 Optimizer engine with the improved metallurgy and improved castings. So I would say since it...
  2. Keesyman

    My New HMMWV

    If it is the GM 6.5 then everything I have read says watch for heat soak and not running in the high RPM range. But with the GEP 6.5L NA or the Optimizer the blocks were redesigned (increased cylinder wall thickness/Oil Port diameter increase) to mitigate the exact issue Coug was talking about...
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