Well here it is I have a 12.5 briggs i/c motor i am currently working on for my build to run in my craftsmen for c/p. But this motor is my whole experimentla type thing for doin all the little tricks port and polish stroker, valves , ec billet retainers and springs, custom rod, the coil by msd and deck the block and so on. And are you positive i have to have a rod made. I thought you could just flycut the top of the piston??