A- 5640....Ultramatic Drive
B- 5660....Ultramatic Drive
C- 5688....Ultramatic Drive
D- 5680....Ultramatic Drive
P- AMC
S- Studebaker....Ultramatic Drive
K- Studebaker....Standard & O.D.
AA- 5640....Standard & O.D.
BB- 5660....Standard & O.D.
1. Service Stripped Engines or short blocks are not stamped.
2. Export Engines starting with 55th Series have XH stamped on block between V just back of the water pump. Same location that Conners stamp engine numbers.
3. Utica Engine number that was stamped on right rear exhaust port flange is now stamped on the front of the block, same location as Conner uses.
4. No change in stamping when head shims went into effect.
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