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Engine Code Designation: Notes

Fifth figure of "Vehicle Warranty Number" on car patent plate identifies engine as follows:

Engine Code Letter
289" 2-Bbl. 200 HP (1) C
390" 2-Bbl. 265 HP Synchro-mesh Y
    275 HP Auto. Trans. H
  4-Bbl. 335 HP S
410" 4-Bbl. 330 HP M
428" 4-Bbl. 345 HP (2) Q
    Police P
(1) Low compression .
(2) Low compression .