what specifically are you seeking? - there's several assemblies on eBay - looks like Ford/NH still services most of the parts, tho prices are quite dear on some pieces -
 
I have a 134 engine from a '62 2000 that I'm parting
out. I'll have to double check to make sure those are
the same between the 134 and 172, but I think they
are. I'd prefer to sell the whole rocker arm assembly.
Email is open.
 
Looks like Ford used the same rocker assembly on the 134 and 172 gas engines for the whole run. The spring washers (if I was looking at the right part) that you need are listed as NLS from New Holland.
 
I'm not positive , but I think Ford used the same valvetrain components on the tractors as the Y-block V-8 of the same era. They might also be the same as the 6 cylinder cars of the same time. I just remember working on both of them at different times and thinking they might be the same parts. We discoverd by accident that the clutch for our Ford Major was the same as the one we used on our F-6 flathead truck. Ford used a lot of the same parts in different applications
 
Thanks for the info. I will keep your rocker arm assembly in mind. Mine shows some wear but seems ok just wanted to replace some parts on it since I am overhauling the engine
 
Try Rocker Arms Unlimited in Redding, California. No connection, other than that they rebuilt the rocker assembly for my Ferguson TO-20.

Their website talks a lot about high-end racing stuff, but their "Specific Applications" tab lists the Ford 172.
 

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