You don't need guide Plates The only time some guys will use a guide plate is when the head push rod hole has been opened up to use a 3/8 dia. push rod. I have ran the BBC rockers for over 18yrs. with out any issues Some guys have also used 1.8 BBc rockers.I have the Comp cams pro magnum roller rockers on my motor. Harland Sharp has roller rockers for our L6s. Other then maybe? the comp cams Pro magnum
Most all others will have a clearance issue under a STOCK valve cover.
God doesn't like ugly.
