My ‘54 F100 was built in June ‘54. My buddy has a ‘54 F100 built in August ‘54. Both were built at the Chester PA plant. Both are EBU blocks. I’m convinced the 13 tooth distributor is large camshaft bearings and the 14 tooth distributor is the smaller camshaft bearings.

  Dennis in Lititz PA

THANX! for that info!

This is the first concrete reference I have come across that the EBU was also installed in 1954 LT. It is randomly referenced in the TRUCK MPC but original parts info was deleted from later versions (updates) as parts availability dropped. You would need an exact period text to ascertain all the details. It (EBU) is also not mentioned in my 1954 TRUCK WSM, only the EBV.   

There has to be a SERVICE LETTER somewhere explaining all of this. There are also many references in the MPC for converting the EBU to EBV for later service replacement.

Correct for camshaft DIST drive gear count.

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Yes, thanks for that info Dennis. It helps shed some light on my car, from an originality perspective. I recently bought a refurbished 14 tooth distributor. It's part numbers all seem to match the numbers on my current EBU distributor, so the info I'm getting from from everyone seems to fit.