| Diagram | Fig. 4 — CYLINDER HEAD AND ROCKER BOXES · ref 41 |
| Subsystem | engine top |
| Listed in parts books | 1969–1974 |
Bolt (1/4 UNC x 3 in. U.H.)
A 1/4 UNC x 3 in. U.H. hex bolt used in the cylinder head and rocker box assembly.
This is a 1/4 UNC bolt, 3 inches long, with a U.H. (undercut head) hex head, catalog number 14-6211. It shows up in the cylinder head and rocker box figures, where it's used to hold the rocker boxes and cylinder head hardware together on the top end of the engine.
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The catalog also lists it under alias number 91247A554, which is the same physical fastener under a different part number. It appears across a range of catalog entries from 1969 to 1974, so it's a fastener that stuck around through several years of top-end assemblies.
If you're rebuilding a top end and need to replace a stripped or rusted bolt in this area, this is the one to check against what's currently in your rocker box hardware before ordering.
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