Make sure that you check for correct length - that may answer your question.
You can also pick up some HP by going to a thicker wall push rod - .080 or thicker will buy you some free HP.
Also be aware that the pushrod wears pattern into you rocker arm so they should be considered a matched set
The 5/16 jobs are barely adequate for daily use when they came out. Throw a cam and big springs at 'em and you're asking for trouble..... All your BBC would have guide plates.
Have fun with the toy Bill
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