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I looked through my 1979 Ford truck engine shop manual, and I cannot believe this, but it is not in there! Anyway, I got curious myself, and looked up the direct replacement part from Comp Cams. The part # is 7837-16 and the specs are 5/16" x9.500".
I actually have a set of a comp cams 9.500" 5/16 pushrods. I bought them thinking i would do a stock rebuild, and ended up doing something different. The part number i have is 7656-16 though. these are "magnum" pushrods though, solid one piece deals.
You can have them if you want them though, let me know.
well one of my heads were giving me hell after a rebuilt due to a crack that was repaired like 3 times now, so Im ordering some cheap heads that are .300 taller...