I have 120's. Before I did the rebuild and tried 20's everything was great as far starting and staying smoothe from 10-30 mph but when I was getting like a slight sputter when I would shift only in between gears so i though they were too big so i went with 17.5;s and it seemed to be better. I origianlly had 15's in it. But man I am very tempted to try the 20's again after the rebuild. Thinking after doing the valve job and cleaning the head and pistons...might need to feed that baby a little more than before the rebuild. Figured getting much better fuel flow so it may be running leaner. This just my guess, I could be dead wrong... just what I was thinking.
Someone please comment on if what i'm saying makes any sense.
THX
