I knew they would all bolt up, the bases are all the same and I knew they would all run but I wasn't sure how how much would be loss by throwing a unit from an M (for example) on my A. I have no idea if more advance is recommended for the C113 or less.
Kind of seems to me that any of the A-140 units would be close enough.
Really it's the curve that makes the difference more then what the final advance is set at right? I mean the H4 shoots straight to 30 deg no matter what the RPM is at, which works and had worked for many year but could be better hence the move to the battery ignition unit.
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