Pushrod for hydraulic cam and 273 rocker arms

I'm half tempted to find an old push rod and cut it and put some threads in it to check for length...

Or I could use one of Eddie's $10 each ones for the "mock up".... (It would also be cheaper than the $20 "checking push rod"....)
Either way would work; the cutting up and threading of the old one would be a very good idea. Put a coupla lopcknuts in it, and away you go.

Yes, on the tech support guys; they do their best, buuut.....IIRC, the Smith Brothers site has a good write-up on how to measure and how they spec lengths.