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The bit size is .089". You can order one online or head down to Lowes and check the section that has tap and die sets. Look for the 4-40 NC tap. That should come with a #43 bit.
So other than the time to remove the tank and rocker box covers is there any advantage to using adjustable pushrods. Thinking about doing this myself and saving the $150 and re-using the stock pushrods unless there is some mechanical gain in using adjustable ones.
One last thing, I am assuming that the stock pushrods are not adjustable. If that is correct is it as simple as pulling them, installing the cams and inner beaings then putting the pushrods back in the correct slot. It just sound way easier than the whole adjustment thing.
Gaskets for the rocker box covers are an additional cost. Adjustables allow you to run a broader selection of cams.
Dont let the adjustment thing scare you, its much easier to do than it is to explain
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