Half the stroke + rod length + piston crown height
3.48”(355 stroke)/2 + 5.625” (holden rod length)+ 1.508”(Piston crown height) =
The 330 is 308 crank ground offset to 2.0" With small journal cheve rods from a 283. I dont know what length they are.
Type of piston depends on compression ratio you want to suit your combo.
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Cheers Tinman
Jack of all trades master of none
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