I lost one of the three muffler bolts on my 1911 muffler. Is the bolt the same size as the single bolt that was used on the later muffler that the dealers have available? Mac's says 14" long.
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At least through early '16, the T-4030 was not a bolt that was used but a 5/16" rod, 13-3/8" long, threaded at each end with a pair of 5/16 x 24 nuts. I don't know exactly when it became a bolt using only one nut but a good bet is sometime in 1917, when an "A" was added to the part number and there was then a T-4030 and a T-4030A.
Sept 1912 Parts and Price List book states:
#4030 Muffler Rod Only 5/16" x 13 3/8"
#4031 Muffler Rod Nut 5/16" x 24 thr.
After your posts, I found this in the encyclopedia:
Rod Removed threads from one end and added 1/2” hex head.
Since my car is late 1911, I fabricated one with one nut welded on one end to replicate the hex head.
: ^ )
The muffler bolts are list next to the muffler bearing in my catalogue.
Every early muffler I've had has the 13 3/8 bolt, three of them.
It wouldn't be the first time that Ford disseminated inaccurate information! In the same muffler section of the Encyclopedia that Keith cites, notice the "black asbestos" note. How many surviving original cars, and factory photos of chassis, show mufflers with black asbestos? Yet Ford was pretty clear about it. Likely there was an unwritten "never used it" attached to the Release notification to remove the "black asbestos".