Re: stock puch cylinder porting gains

Mr. Duncan /
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I recommend just port matching your intake and exhaust at the flanges to make a smooth transition as well as polishing up that exhaust port real nice. I've never run a proma with a 15, but I ran one with a 15 sha and the engine with that pipe performs much better under load. I'd suggest gearing at least around 16-45 or maybe even throw a 17 up front. Or if you live somewhere flat throw a 40 out back. Gearing will be your best bet for making the most out of that pipe.

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