May have three angle valve cut. NO angle milling, porting or polishing allowed. May have screw-in studs and guide plates. Intake 1.94 max. Exhaust 1.60 max., all others O.E.M. stock as manufactured.
Single valve springs only.
After market retainers okay. Stock type rocker arms, standard ratio only or stock ratio, stock style replacement roller rockers optional. Poly locks allowed. NO stud girdles. Any flat tappet cam allowed.