You need to scrape the paint off the serial number pad to reveal the letters in front of the 'A'.
The 'bb' are number sixes...so you have a partial code/serial number of 'A85466".
xx = missing info that would tell the year and model it came in.
A = Flint Engine Plant
85466 = Unit number starting with 1001, so you have the 84,466th engine built in Flint for that model year.
Mike B
