That's the thread, thanks. W.O.T., take a few minutes and read that thread. Not only does it make sense, but after looking at your pics, I think you'll be inviting BIGGER problems by going to shorter pushrods without addressing your short studs (short in overall length or in thread length). Doesn't it look odd that it broke at the bottom thread, but inside the poly lock?
Two thoughts:
1. Buy a set of ARP +.100 studs.
2. Make sure you are not using the lock to push against the top of the stud to get the required tightness to hold it in place.
I had a stud do that in my car. The break was just like yours and clean as a whistle. I went to the longer studs and learned the proper way to tighten the poly locks. (hold the wrench in place and tighten the lock rather than back the wrench off a hair and giving a twist with the lock tight against the top of the stud and then turning the wrench)
Gugs
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