Ran it in a stock 383 with 452 heads and 9.5 comp. It had the normal bolt on's of the RPM intake and a 750 DP. Had headers and a 3000 tight TA convertor with 3.91's. In my sons Dart at 3600 lbs with him in it the Dart ran as fast as 12.31 @ 110 ! This cam will make good power and run very good in the right combo. But I would not use it in a stock 383 or 440 with a stock convertor and 3.55's. Most people who dont like it just did not run it in the right combo. Ron