pushrod end

For a pushrod the end that goes to the lifter on a BB mopar solid cam should that be 5/16 or 3/8"? Seems a lot of places have the pushrod spec'd at 5/16 cup and ball, but I see some pics that the ends are 3/8".

Depends on the lifter. Best practice is to measure your lifter with a radius gauge and then order the correct pushrod end.

Andy,you have all the cool tools.I have a gojo bucket with a variety of ball bearings and hope to have the size I'm looking for and measure with a caliper

All the early Mopar lifters, before 1967 I think, had 1/4 inch cups in the lifters, from 1967 up to when Mopar converted to roller lifters all of those post 1967 lifters had 5/16 cups.
A lot of the race solid roller lifters have 3/8 cups in them, as already said always measure to make sure when in doubt

You can't take any of that for granted anymore. We all use aftermarket lifters and rocker arms and there is no telling what size the balls/cups will be without measuring. Pick up a cheap set of radius gages on ebay or

http://www.shars.com/products/measuring/reference-gages/1-64-1-2-radius-gage-set

Chinese tools make some things affordable for the hobby guy today that a man used to have to do without.