The M8 engine platform is capable of making massive power. It happily accepts big bore kits, stroker cranks and of course high lift cams. S&S Cycle just added a 590 lift cam to the mix.
The new cam is designed to work with their 131-in. stroker kit and other huge bore combinations. Producing massive horsepower especially in the higher RPM range, the 590 is available in gear or chain drive and is 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 and 145tq on a 131-in. stroker build).
Link: S&S Cycle