I have a 408 stroker in the works. I went with a re-ground cam. Saves cash at around $150 plus shipping vs $350 for new, plus I can reuse my distributor gear. Here are the specs from Ken at Oregon Cam Grinders #1357 230/236 @ .050”, 284/290 adc, .515”/.515” lift (1.6:1 rocker), 108 sep As you can see it's close the Comp cams thumpr. I believe its typical to install the Thumpr 4 degrees advanced, bringing the torque curve into a lower RPM range. I also understand some cams have some advance built in. I can clarify with Ken but just thought I'd ask about this here and get comments on this cam.