What is the diameter of the ball part of the stud? (I'm hoping they are Ø3/8")
Thanks!

 

Just curious as to why you want to know?
(I don't know the diameter, sorry)

 

I figured someone would ask...
Real long story short. I made a bunch of roller rockers for FE's and am looking for a cheap alternative for the adjusting stud and nut. It looks like the studs for the Y-block are exactly what I need provided the ball is Ø3/8" so it fits the FE.(7/16 - 20 thread, 3/8" ball end, about 1 3/8" long) The Y-block stud is available from Dennis Carpenter for $2...cheap enough.

 

B6A-6549-A .. Rocker Arm Adjusting Screw-Two Piece Design = 7/16" -20 X 1.54 // Used 1952/56: on 215/223 I-6's & 1954/56 Y blocks only.

EAA-6552-A .. Lock Nut / 7/16" -20 / Used only with B6A-6549-A
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B6A-6549-C .. Rocker Arm Adjusting Screw = 7/16" -20 x 1.40"

C2AZ-6549-A .. Rocker Arm Adjusting Screw = .0023 O/S from the one above.

 

Talking on the phone, ran out of editing time...

 

I have 5 NOS rockers sitting here. The diameters of the ball ends of the adjusters varies, from .352 inches to .360 inches. I guess that is why when pushrods are removed they are supposed to go back to the same rocker.

 

Bill, By 2 piece I assume that's nut and stud? It doesn't happen to list the ball size does it? (I'd be surprised)

46Yblk, Judging from your numbers it indicates closer to Ø3/8" than Ø5/16" in any case. Sooooo, shall we assume its Ø3/8"? And yes, perfect scenario depicting why it's important to keep these sets together...
Thanks guys!

 

Nut and stud is correct for the early setup.

I looked thru several Ford car & truck parts catalogs, that's all the measurements I could find for the early setup.