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The large pulley in the photo is marked GM 3790356. From the face of the pulley to the back edge is a little over two and three-quarter inches. It's not 4 inches deep like what you need. Sorry for the bad news.
Thank you for looking. My truck is at the paint shop and will be for several weeks as it waits its turn. I'll keep looking for a pulley. There are a couple on Ebay that I have been watching (for a price reduction).... My Dad used to say "I'm not cheap - but I'm reasonable"!! I appreciate all of your responses and will keep up updated on my progress. Tim-o
Just a brief update. It took me almost three years to get off my wallet and buy an aftermarket air system from Old Air for the '66 C10 250 6 cylinder. I had the system charged last week and the air blows a cool 43 degrees. I worked a couple of months on the install following the detailed instructions from Old Air and adding an electric fan to the install. I must admit, the project stretched my mechanical abilities (you have all read my posts) . I did have help - in that John Price from Old Air answered my MANY questions - no matter how trivial - by email and on the phone. All in all - it was a fun project and I got to know my truck much better. I guess what I'm saying - if I can accomplish the install - almost anyone can. Tim-o