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    1. #7
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      16,118
      Country Flag: United States
      There are two things to consider. First the flywheel register diameter and then whether the engine is internally or externally balanced. The early engines had a different flywheel register diameter on the crank as compared to the later engines. All later engines were externally balanced in stock form. That is the reason that GM changed the register diameter so an early flywheel would not work on a later engine.

      Now a later engine can be built so it is internally balanced so in that case a "hybrid" flywheel must be used. One that is neutral balanced but has the later flywheel register. Clear as mud!?!?!



      Andrew
      1970 GTO Version 3.0
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