i run the rings and put the cam where curtis told me to to better use the heads flow. at 900 lift the heads flow 465 ish 325 ish on the exh huge numbers for conventional heads i did talk to james monroe he makes 1200 hp with his 582 with 1 terminator thats impressive i asked if there was an advantage to running duel terminators and he said it would be a waste of money on my combo and that 1 is perfect.sounds like a straight shooter to me jeff