I'm just hear for the beer, I would stay with a proven product for a street application with mod's. Using power causes things to give under stress. You might be causing yourself grief in the future unless you have deep pockets. Thirty five years ago I went to after market big bore cylinders, stroked it, head work done by Branch, flowed ported reshaped combustion chamber, over sized valves heavy duty springs, 700 lift cam, S&S G, Dyna dual coil single fire ignition. It ran and sounded great. I dealt with a oil leak between heads and cyclinders oozing out. I don't think there was enough real estate for the gaskets to do their job because of the bore, also I know there had to be alot of vibration on the heads. I had to plug up the oil return and run it outside down to the cases, looked trick. I couldn't get the bike to quit kick back when go to start it. I had to wire it to get the motor to turn in the right direction then after turning over put the fire to it. Also, I would get about 2,000 miles before I would break a valve spring. But I was into it and nothing else mattered. It's what floated my boat. I just wanted to say I know nothing about the Patrick Racing 131 cu in motor. I didn't ride for about 20 years, just got back into it about 4 years ago when I found my Big Dog.
www.jpcycles.com
