valve train

You might be more specific on what you are looking for, but John Mummert is a good place to start. NAPA could be a good source too.
 
Schumann in Iowa sells shafts that have thicker wall than stock and are no more expensive than others.
 
Unless it's for the supercharged / high perf engines, or the: 1.43 vs 1.54 rocker arms, locknut vs self-locking adjusting screws and improved push-rods...
original 292 and 312 valve-train parts are effectively the same.

You might be more specific on what you are looking for...
 
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