Rocker geometry is right on. Definitely not coil bind.

I was thinking spring surge (too much distance to coil bind). Surge can cause havoc - and break parts.

Rocker geometry is right on. Definitely not coil bind.

The cam is a solid roller 244/252 @.050 and .640 lift. Shifting at 6600 going through the traps at 6800-6900.

I took the Comet to Brainerd this weekend with the new motor. We had dyno'd it and it made 540hp. We tried 4 passes with the E85 Carb and could not make full passes due to it running very lean and not wanting to hurt the motor. I then put on my race gas carb and the car responded with a 10.99 @123mph. We went up for our next pass and it ran 11.02 @124mph but on the top end made a funny noise and my boy shut it down. An exhaust push rod had broken the adjusting cup.  Before installing the motor in the car I rechecked the valve lash and retorqued the retaining studs. When I removed the rocker assembly with the broken rocker, I found the ARP stud next to it was slightly bent. By all appearance the adjuster had not backed off and the bent stud next to it still appeared to be holding torque. My assumption is that the 660 open spring pressures are just too much for the stock style T&D setup to handle even with the EZ lock inserts installed in the heads to prevent pulling out. What do you think, I don't have 3500.00 bucks to get the race T&D's this year. would you give it another try with new studs and what I have and hope this was a fluke? Thanks for your thoughts. Jim

yes,they are.