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never knew that the 440 6 pac used anything but stock rockers from the factory....



I don't know, I just remember that Hughes Engines used to sell a heavy duty version of the stock rockers and they were listed as six pack rockers, IIRC. What I'm really looking for is a rocker arm that'll handle around a .550 lift cam & still fit under a stock valve cover.



Sometime in the late 60's the stamped rocker got re-inforced at the tip to make the "6 pack" rocker.

Since then Chrysler and the aftermarket standarized on the heavy duty design. Any new replacement stamped rocker should be the "6 pack" design.