You can do it any way you like, on the PVRC go easy at first, not huge I would try .003 to .005 smaller in I.D. to start with The primary main jets affect the light part throttle cruise AFR as well as at WOT, the secondary main jets affect WOT only, usually
Last edited by Cab_Burge; 03/19/1801:51 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
I would try .003 to .005 smaller in I.D. to start with 
