Ray,
You might try putting a 3/8 belt on the 1/2" generator and/or water pump pulleys (if that's what you have) and see if they fit ok.
(let me add that I think you actually DO have the narrow groove pulleys unless your engine came out of a 55. (there was no 292 for trucks in 55 btw)
If your truck & engine is a 63, it should have the narrow pulleys unless someone changed them.
The damper I offered you came off the
1960 292 I am putting in my 55 F-600. Right after I had it rebuilt by the "DD" I found the 2-groove damper (that I'll also have him rebuild)
It would be MUCH easier to get 3/8" generator and water pump pulleys for your truck than find a 1/2" damper I would think. If you need a 1/2" pulley damper, and you can find one, I know the "Damper Doctor" can rebuild it for you. They're pretty rare though.......
I don't have the one that came off my original 239 V-8. The guy that bought the engine from me wanted it along with the very rare high-mount water pump and fan mount.......!
Ok,
I went out in the shop and actually found a damper (for a 56 272 with high mount fan) that I also decided not to use. (It's not the one that came off my 239 though)
It DOES have a wide groove for the fan (only I think). The other one is the damper I took off my '60 292 and had the Damper Doctor reman.
I used a tape so you can make dimension comparisons to what you have.
The one on the left has a wide fan belt groove for a "High-Mount" fan. The painted & sleeved one is black from the rebuild by the DamperDoctor.




Hope the dimensions assist you in figuring out what you need......the tape is graduated in 1/16th inch
Cheers,
Rick
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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!
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