Hey Cab,did you ever give these a shot? How did you like them? My old headmans bit the dust.. blew a hole I the #3 primary right next to the exhaust port. I really want Doug' 452's. But they're only available with a 2" prinmary !! ..don't wanna sacrifice the low end on my mild combo. i definitely plan on stepping up my cam in the future, so maybe the Doug's won't be a bad choice? This is a .040 over 440 with 10.3-1 compression and the .528 solid purpleshaft. Promaxx 210cc heads,Performer RPM,3600 stall 3.91 gears. Any info would be appreciated.