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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.






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"

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



Cab, are you taking in to that that the ball will
be lower in the cup with the 5/16 and not just the
diameter difference
To the OP... if you were to say the same year engine
the lifters are the same... never knew why they had
different P/N but the measurements were the same...
I have used B RB lifters in my small blocks on
different cams... all of them were roller lifters