Ok, we've fired up the engine with the new aluminum head. It starts pretty easy, revs up to about 1500rpm, then runs REALLY rough and stalls in a few seconds. 
This entire sequence is without applying any throttle and lasts about 5 seconds before stalling out.
I'm using the stock (non adjustable) rocker assembly & stock push rods and I suspect that the assembly is too tight and not seating all the valves.
To test that theory I loosened the rocker assembly a bit so that the valves could close more and the engine ran much smoother.
So now I'm strongly convinced that either the stock rods are too long or that the rocker arm towers need to be shimmed.
What have the rest of you done when swapping to the C.I. head? Did you keep your stock rocker assembly? If so, did you shim it, purchase new rods, or did it just work?
Thanks,
Lance Robaldo
This entire sequence is without applying any throttle and lasts about 5 seconds before stalling out.I'm using the stock (non adjustable) rocker assembly & stock push rods and I suspect that the assembly is too tight and not seating all the valves.
To test that theory I loosened the rocker assembly a bit so that the valves could close more and the engine ran much smoother.
So now I'm strongly convinced that either the stock rods are too long or that the rocker arm towers need to be shimmed.What have the rest of you done when swapping to the C.I. head? Did you keep your stock rocker assembly? If so, did you shim it, purchase new rods, or did it just work?
Thanks,
Lance Robaldo
