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The lifter "body height" is 1.832".

I can't find a 3/8" ball around here. I'll have to get one and then measure it.

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So I picked up a 3/8" steel ball at the hardware store.

The steel ball measures .375".

With the steel ball in the lifter, they together measure 1.922"

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That measurement tells me that the effective length (bottom of the lifter to the bottom of the pushrod cup) of that lifter is 1.547 using the 3/8 ball bearing instead of a 5/16 diameter bearing Do you know if that is a later, 1967 and later, 5/16 lifter cup or is it one of the 1966 and earlier lifters with the 1/4 inch lifter cup seats in them