186 Heads - Were all the rocker studs 'pressed in' during the 1969 302 production year or did the Flint engine plant switch to a 'screw in' style stud, with push rod guides, at some point during the production year?
No screw in studs prior to 1970. Screw-in rocker studs with steel rocker guide plates started in 1970 on the Corvette LT1 and Camaro Z28 350 ci engine.
Jerry - thanks for clarifying