I use different thickness rocker arm shims, they come in .015, .030 and .060, to space the intake rockers away from the intake ports on the heads and to help center and align the rocker arm tips on the valve stems up IHTHs

Last edited by Cab_Burge; 04/16/15 03:10 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)