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Old 01-29-2010 | 08:02 AM
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Trisquire
 
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Default RE: New generation of
According to what I've read, the size of an early '70s 60 engine would have been like your 55AX or Evo 60. Sometime around 1975, the engine manufacturers all increased the physical size of their 60s. That's why your OS 61 SF is bigger.

Tom
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