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How many threads are captured by the adjusting nuts? I would recheck the length of your pushrods. It looks as if they are too long causing the static position of the rocker arm to be too high on the end with the pushrod. As the cam raises the rocker arm up, and it starts to "Rock", the arc that the upper cup travels through causes the pushrod to move in the guide plate toward the stud. As the limit of travel was reached (as it pivoted) and the cam continued to force the rocker arm, it forced the pushrod into the bottom of the slot as it was bending it over the edge of the guide plate. It reached the travel limit and with the stud in severe tension it popped. Get the ARP studs and check the pushrods.
This situation gets worse if you are using 1.7 ratio rocker arms.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 03-28-2009 at 01:16 PM..
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