Morris Minor Owners Club

what does dd on tag mean[frame][/frame]

Done and Dusted?? It's a recon engine - so probably the initials of whoever did the job.

My gold seal had AH stamped on it in a similar fashion, so BMC could be right.

Ah now that's interesting - I was wondering if DD was maybe a code to show the regrind size on the crank ie 40/40 But AH doesn't fit with that. Would be easy to argue that AH = Austin Healey of course - adding an extra £50 to it's value !!

DD could be Dodgey Daves work, reducing the price by £50

bmcecosse wrote:Ah now that's interesting - I was wondering if DD was maybe a code to show the regrind size on the crank ie 40/40 But AH doesn't fit with that. Would be easy to argue that AH = Austin Healey of course - adding an extra £50 to it's value !!

Well actually it does on a recon unit. I found this online - The first letter relates to the new bore size (oversized). The second letter is the reground Crankshaft size (undersized).

Letter Size changes (Thousandths of an inch)

A Standard
B 10 THOU
C 15 THOU Undersized (Crank only)
D 20 THOU
E 25 THOU Undersized (Crank only)
F 30 THOU
G 35 THOU Undersized (Crank only)
H 40 THOU
J 45 THOU Undersized (Crank only)
K 50 THOU
L 55 THOU Undersized (Crank only)
M 60 THOU

Mine was F’ ‘H’. This according to the above information would make the pistons +30 thou oversized and the Crankshaft -40 thou undersized which is what it was when i took it apart

I just checked my recon engine in my pickup and it says AD.You learn something new every day

My gold seal was standard bore, so looks like the above chart is the answer.
Still going to tell people it's an Austin Healey motor though

The letters relate to crank regrind and rebore sizes