To clarify the question/concern with 12-Port rocker arm assemblies:
The early Wayne Chev 12-Port heads utilized the 40 series Buick rockers with the custom aluminum stands.
The Wayne, Horning/Fisher, & the Howard 12 Port GMC heads all utilized the stock GMC rocker arm assemblies.
The new Wayne Mfg Howard/Arias head utilizes a roller rocker assembly with custom stands. The plan was to utilize the same roller rockers on the new Wayne Chev 12-Port heads (which would reduce inventory requirements at Wayne Mfg)
Hope the above helps
Pat.
