[Bob Mulry]

Looks prety simple to me..........

The cylinder head rules in Stock didn't change and that states "The following are permitted: polylocks, jam nuts, screw-in larger-diameter rocker studs or pinned studs, bronzewall valve guides"

The ONLY rule that chaged was the ability to use aftermarket rocker arms and they did NOT have to be (as the old rule was) "Aftermarket rocker arm must be identical to OEM. Either adjustable pushrods or adjustable OEM rocker arms permitted on any application, but not both. OEM roller rockers permitted ONLY if application was originally equipped with roller rockers"

The difference is now the rule says "Aftermarket rocker arm permitted. Either adjustable pushrods or adjustable OEM rocker arms permitted on any application, but not both.

Looks like stud mounted roller rocker arms for the OEM stud mounted engines and T&D's for the OEM shaft type rocker arms.

I don't like the rule but is seems pretty clear on what their intention was.