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I have a set of stock ductile iron adjustable rocker arms for a big block. Do I need different rocker shafts or can I use the original hydraulic rocker shafts that were for the stamped steel rocker arms?



I hate answer a question with a question.............

but it depends on the valvesprings pressures and cam lift you're going to use. Just my opinion, but if it's .510 or less you can probably get away with the stock rocker rails. Not sure, but that's probably what the old late 50's Long Ram and early 60's Max Wedge had.

R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04