To the OP:

You can run stock stamped rockers on your Edelbrock heads IF YOU GET THE PUSHROD LENGTHS RIGHT!

You can run 273 adjustable rockers on your Edelbrock heads IF THE PUSHROD ENDS ARE THE RIGHT SIZE AND SHAPE!

Speaking from a mechanical engineering standpoint, there is no advantage to using roller bearings in a rocker arm fulcrum, as long as the plain bearings are adequately sized and fed the proper amount of oil to provide the hydrodynamic wedge. Look at Isky's roller lifters that use plain bearings in the rollers.

Aftermarket rocker arms are much more likely to have a correct ratio than stamped steel rockers. I don't know why this is so, because it would take no more effort to stamp a correct ratio rocker, but nearly all of them are short on ratio, meaning real valve lift suffers. Now if the engine is overcammed, it probably doesn't hurt. But with a properly sized camshaft, the short ratio really does hurt power.

For any rocker that one uses, using the correct length pushrod with the correct ends is a necessity. It's that simple.

I believe the reason Edelbrock says to use adjustable rockers is to avoid problems with pushrod length.

You know, a customer buys the heads, installs them with stock pushrods that are the wrong length for the assembly, then blames the head manufacturer. Customer goes online and blasts the head manufacturer. They don't need this.

R.