we run the Big Chiefs with 3 different offset intake rockers we also relieve the valve train for the winter not sure every one does that

Steel is definitely the way to go especially solid roller.

With aluminum Jesel has 3 types A, B and C:
https://www.jesel.com/pro-aluminum-series-shaft-rockers

In aluminum you`d want the full body no slots which is the strongest and you want the strongest rocker on the exhaust like they did on the one picture you posted.
Exhaust is working against all that cylinder pressure they take the most abuse.
You`re not the only one with this issue.

Thanks for your reply’s. Here’s what they made in the bench. Think I will order two sets of the pro steel from Jesel. Also will send the Mohawks to Jesel for rebuild and inspection, can’t hurt to stop in another engine. I live in Sweden so we don’t measure fuel octane like you and the engines where given 95 octane in the bench and I think that will compare to your 87 or 89? Timings @30 degrees

I like the AFR`s alot better in teh first dyno pull, that second one especially at peak tq (highest cylinder pressure) is scary to me (almost 13 afrs) ... is the timing locked at 30* ?

It’s both engines. One sheet per engine. Timing’s not locked just set to max 30 degrees.

Go-Fast Valvetrain

simply the best at rocker arms.

You may want to look at that cam lobe and lifter.

Feel free to let us know why yours ‘are the best’ :thumbs

I`d richen up that lean engine asap.

if they use an a/f calculation based off actual fuel flow, and an air flow meter it usually comes in almost 1 full number higher than measured with a wide band in the exhaust or at least our super flow dyno is that way.