Blew it up... GRRRRR!!!!!

redfastback said

I have the same heads and cam. I used the MP HD rockers and have run them for about 12k miles. I am stunned that you blew these so fast.

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If I am not mistaken the MP stamped steel rockers have more meat in the pushrod cup to aid in the bigger cams and higher rpm's. Might try you a set of those to see if that cures the problem. Just my 2 cents.
Matt