[Steve Plucker]

Originally Posted by chet

These engines ultimately got a serial number and were incorporated into the production line. Somewhere, I had seen a document that gave the approximate quantity of engines produced. Guess is that after Ford did there evaluations, the engine ended up on the assembly line as NOTHING was wasted.

According to Ford’s records of Daily Produced Engines that were assembled between July 9, 1928, (A236787), and October 2, 1928 (A477642), a specified number of “Special Experimental Engines” were produced.

What made these “special” was that the Oil Return Pipe Assembly, A-6645, along with the Oil Return Pipe Connections on the block, A-6015, and the Valve Chamber Cover, A-6520, (Fig. 21) were all deleted.

The addition of oil return holes were drilled on the floor of the valve chamber (Fig. 19, 20) to allow the oil to drain back into the Oil Pan Assembly. Each engine had the regular Model A/AA engine number stamping to indicate 1928 production.

Between 1353 and 1355 engines of this type were built. These can be substanuated by the Part Release data of April 23, 1928 for each specific part that was changed and those few engines which have been documented. Two engine numbers have been documented so far: A259209 (July 17, 1928) and A286625 (July 29, 1928).

NOTE: The above information came from: “Authentically Speaking: Inside Oil Return System (The Experimental Engine: July 9, 1928 through October 2, 1928)”: Model A News/35/3/9 (1988) and Vol. 7 of MARC’s “Technically Speaking”.

Pluck