Doug -
A) I do not have hydraulic lifters. I have mechanical roller lifters.
B)The rocker arms broke as a result of bad parts selection, lack of attention to detail and poor set up of the valve train. The breakage was a symptom, not a cause in and of itself.
The rocker arms themselves were not defective in material or workmanship. They have proven themselves in more severe applications when properly set up.
It should be pretty clear what the issues were that resulted in failure and it was NOT THE ROCKER ARMS THEMSELVES
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