Engine Serial Number Question

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My 1929 Roadster's engine does not have the Stars before and after the serial number. The SN# starts with a "II" not the typical "A" listed in the documents found on Ford Barn. Does anyone have any idea about this SN#?

[40-A Twins]

One of mine also does not begin with star and A because it was a post Model A manufactured motor known as "diamond" block for the casting mark above the side timing cover. Check your motor for this casting mark. Some of these motors were used on farm equipment and thus did not get a typical serial number.
Kevin

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Originally Posted by 40-A Twins

One of mine also does not begin with star and A because it was a post Model A manufactured motor known as "diamond" block for the casting mark above the side timing cover. Check your motor for this casting mark. Some of these motors were used on farm equipment and thus did not get a typical serial number.
Kevin

Thank you very much. It has the diamond.

[Russell Reay]

Mine does not have a diamond, but also does not have the stars. Does that mean mine is a rebuilt? Going by the numbers alone it was mfg in January 1929. If rebuilt and re-numbered, how likely is it that they stamped the same number, but w/o the stars?

[40-A Twins]

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To figure out the manufacturing date, look for this group of numbers just below the oil gallery around 6" or so aft of the diamond. Yours will most likely be different numbers than mine is. Month/Day/Year: Month is represented by a letter. "J" is 10th letter in alphabet, so build date is 10/21/1936.
Diamond blocks have some upgrades like hardened exhaust valve seats and a B cam, plus a few spots that were often thin in regular production A motor castings are a little thicker and not so prone to cracking.
Kevin