93-95 L67 or 93/94 L27 heads as I stated above.

ZZP may be unaware of the 92 head differences. Or theirs are for 92 and not the other years?

my bad

They have 5/16, which they think is 93-95, but I can't remember which it is.

So, would the problem with using the ZZP rockers on earlier heads be that the mounting studs are the wrong size? Can this be worked around?

Can the rockers be drilled out? Can the studs be replaced?

Well, I'm sure theres a minor gain 5-10HP from the rockers having rollers on them, but maybe a little more HP and I'll get them.

Don't forget in addition to the roller tips, they are lighter and have a higher ratio.

Keep in mind, the L27 and L67 starting in 93 had roller fulcrum. This was maybe only a 5hp gain over the 92 L67 and L27. The gain is from the ratio itself. Even the roller tip won't gain any amount of horsepower you could characterize or claim.

I gained 2whp for going to roller tips on 130lb springs. NO other changes! And another 11whp moving to 1.7 rr'*.