Charlie,
I did fit a 1/2" on my Butler wideport heads. I had to drill the hole with a 5/8" bit on the milling machine then elongated from front to back. It works but I change my combo to an IA2 block and needed a different length from using Marty P's sealing rings. I am currently running a 7/16 straight with .135 wall on my setup. How long of a pushrod do you need?
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