i run 10.40,s,,,126,inna 55 chev sm blk 3700 lbs,13 to 1 an there kb,hyper pistons ,,,i never had a bit of problems with them,300 runs,,,there fine as far as i c,the top ring has to b set out some more gap than usual,they give u the formula in directions for setting out top ring gap...
I shift at 7000 go thru the lights at 7500