Picked up a set of these mounted on 324 rocker shafts. They were suppose to be from a J2 engine with the dimple covers that debut with the Nascar J2R engine. These are in excellent shape but I have nothing to compare them to for verification. I know that back in the day one of the things seen was the adaptation of the Studebaker adj rockers for the early Cad V8's and supposedly the early Olds as well although it has been said by people in the know that they are not suitable for the Olds. In addition, it has been said that Isky may have made the rockers for GM. I believe there were 500 J2r's made according to what I have read on the web (not always true). Isky also made the dimple valve covers for the aftermarket when GM stopped offering the J2. Hoping someone on the Hamb has some reference data or items they could compare to determine if these were in fact from the J2 engine or perhaps from the Stude. Here are a couple pics for reference. measuring from the center of the shaft to the center of the adj is 25/32 and to the center of the tip is 1 1/2 if that helps.
Good call saltracer! I searched for McGurk and found this old cl***ified add: NOS McGurk Adjustable steel rocker arms | The H.A.M.B. (jalopyjournal.com) Hamb to the rescue again. Thanks.
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