If new arms are of the same ratio as the OE arms, OE pushrod length would be good. I'd probably install chromoly pushrods.
If you have the cam card from camshaft manufacturer, read it. The card will have the lash on it. If no card, then measure & record the present lash before the swapout. Add up the intake side & exhaust side respectfully, and average them out for a new setting. If you end up with an odd number, subtract .001" to make it an even number. I have yet to read an odd number for a lash setting.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.