The Crane catalog shows that along with the stage 4/5/6 heads, the added offset rockers also fit B1/BS and Indy SR’s.
I can tell you that the original std port stage 6 doesn’t need the extra offset, and neither do SR’s.
In fact, the added offset rockers on earlier stage 6’s would probably need more tweaking to the head than if you were using the std rockers.
Part of the typical/normal stage 6-isms........ intake pushrod hole locations could vary quite a bit.
My guess is the HS made Mancini rockers would work fine on std stage 6’s, and that normal HS rockers could end up being longer than optimal.
