[Alan Roehrich]

Jeff, Holroyd's rockers are STOCK GM, the studs and adjusters are similar in material to the ARP rocker studs.

We can get by with the 7/16" stuff, there are even some fast cars still using 7/16" rockers. What we broke 2 years ago at Gainesville was an ARP rocker stud, it broke at the base of the threads. I was going to upgrade to the ARP Pro Series studs when a friend turned me on to Holroyd's stuff.

The rockers themselves will still fail the same as the 7/16" rockers, ask a couple of the real fast guys.

If you are willing to replace the rocker studs often enough (the ARP Pro Series studs are $100 or so) you can run the stock diameter studs and rockers. You MAY lose a little to deflection.

NHRA allows all engines to run aftermarket studs, and even convert to screw in studs when they were not originally equipped.

Some big block Chevy high performance engines came with 7/16" pushrods. We (as well as most I know) currently use 7/16" straight pushrods and GM guide plates.

Again, I'd LOVE to see a solution for the rocker problem so that guys with the less popular stuff could go buy good parts for a fair price. I DO NOT want to see cars parked.

However, allowing roller rockers will absolutely bring about serious unintended consequences, for the reasons I outlined earlier.