Did they change anything on the rockers from the oldschool GenI SBC to the roller blocks?

 

Self aligning, not sure when exactly that change took place. Slots for pushrods mean you can use non SA rockers, if no slots (big holes) then either SA rockers or guide plates.

Is that what you are asking?

 

Pretty much, just wondering about the interchangability of the 2...

Say you wanted to run the newer SA rockers on an old head or non SA rockers on a new head...

 

oh, I know sofakingdom wrote up a little info on it before, let me see if I can regurgitate it here:

You need one (and only one) method of aligning your rockers.

-Slotted pushrod holes (stock before 199x)
-Self aligning rockers and big round pushrod holes (stock after 199x)
-Big round pushrod holes and non SA rockers, but guideplates (only aftermarket)

You can't really use more than one method, else you run the risk of them binding.

You can grab a 1/2 drill bit and gouge out your slotted pushrod holes and use SA rockers, or guide plates.

You can run non SA rockers on a newer head that has the big holes, if you cut down your rocker stud boss and use guide plates.

So yea, you can pick and choose your method. As far as what's the best method? I think guideplates are most common in aftermarket, maybe that means they're superior? I'd be inclined to think it's the SA rockers though.

 

Keep in mind that you'll need to buy hardened pushrods if you decide to use guideplates.