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  1. rdixiemiller

    OA 331

    8:1 Compression is fine for regular pump gas.
  2. rdixiemiller

    OA 331

    If the main caps are broken, the engine is probably not worth building. You will have to line bore the block when you change the caps, they are not a bolt on replacement. Your rods will probably have to be resized as well. OA 331's are not that uncommon, I have seen a few in junkyards over the...
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