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  1. jwaller

    Question: AMG vs. GM 6.5's

    6.2's are not being rebuilt. thats why the NA 6.5 came about. the 6.5 NA is the replacement for the 6.2L. the 6.5NA has been detuned to match the 6.2 performance.
  2. jwaller

    Question: AMG vs. GM 6.5's

    and lastly. The Optimizer 6500: Engine Builder basically you want a 1999 and later block. the 07's and up are the very best.
  3. jwaller

    Question: AMG vs. GM 6.5's

    Main Bearing Web Crack: In both 6.2L and 6.5L engines this is reportedly fixed with a combination of improved higher nickel cast iron alloy and lower block re-design including, but not limited to, a main bearing girdle. These features are in the new for 2007 AM General GEP P400 6500...
  4. jwaller

    Question: AMG vs. GM 6.5's

    the latest castings are indeed better. the old gm 6.5's had issues with #8 cylinder deck cracking. you want the latest GEP block
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