on top of 1st ring was over .350. this is a heavy piston made for lots of gas,max rpm will be 6500-6800. roller cam was more money and i've had great luck with solid flat tapet cams the break in and right springs are the key factor. also my ring gap is 35 top 29 bottom so it should no burn up top ring. and the 400 will be total in 2 stages 250 off the line 100-150 about 3 seconds out.
i will get new carb in future the 850 is all i afford for now.
thanks for comments, keep them coming