Don't know if it's a good comparison or not but I have '03 REV 800 and ran about 50/50 with an F7, both stock. Sometimes he wins, sometimes I win. Sold my brother my '95 Mach 1 670. When we ran the Mach with the REV, I thought I had him smoked, turned to see how bad I beat him and he was only about 60'-70' back at about 90 mph. That was about 8" of snow. Mach=144 studs, 2800mi. REV=96 studs, 3900mi. Since all this, I have added new 1 1/4' ripsaw track w/ new woody's, MBRP can, VF3 reeds and have clutch kit on the way. The 670's are very fast and if you listen to these guys they will have you beating the F7. Don't know about the reeds though, the '95 Mach I had was rotary. The stock pipe should be good. Maybe change duration on the rotary valve, bump ignition timing, re-jet, and like SEG said, clutch kit.
Guess I'll shut up now, rambled on long enough.
