The M8 engine platform is capable of making massive power! It happily accepts big bore kits, stroker cranks and of course high lift cams. The 590 cam is designed to work with S&S 131” stroker kit and other big bore combinations producing massive horsepower especially in the higher RPM range. The new 590 cam is available in gear or chain drive and specifically for use with monster bores, ported heads and high RPMs, to make maximum horsepower! Not recommended for stock bore engines. Check out the dyno charts for the hard numbers (146hp & 145tq on a 131” stroker build!) and for more info hit up - https://www.sscycle.com/feature/valve-train/m8-valve-train