| Diagram | Fig. 1 — CYLINDER HEAD — ROCKERS · ref 39 |
| Subsystem | engine top |
| Listed in parts books | 1971 |
BSA Stud — rocker box (5/16" U.N.F./UN.C. × 2")
A 5/16 inch U.N.F./U.N.C., 2 inch rocker box stud for the cylinder head area, per a 1971 parts-book listing.
This is a rocker box stud, listed at 5/16 inch U.N.F./U.N.C. thread and 2 inches long. It shows up in the cylinder head and rocker gear section of the parts book, which places it up top where the rocker box bolts down to the head.
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Studs like this hold the rocker box in place under repeated heat cycling and vibration, so they're worth checking for stretch or damaged threads any time the head comes apart. Our record for this one is limited to a single catalog listing from 1971, so we can't speak to a broader fitment range beyond that.
If you're ordering this for a rebuild, have your rocker box off and take a look at the thread condition before you commit — call the shop if you want us to confirm this is the right stud for your engine.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
Sorry if we got something wrong here. If you think this information isn't correct, .