The distributer for the A90 Atlantic is: Lucas – type DVX4A

in one of the earlier service book (June 1950) I found DK7.4A.

later Lucas DM2 (P4)

later type starts May 1951

Service number = 40320A/B

rotation = ClockWise

ECM curve = 430

Model = DM2P4

RPM 1 = 2500 / Advance1 (± 1°) = 17°

RPM 2 = 1250 / Advance2 (± 1°) = 9°

RPM 3 = 600 / Advance3 (± 1°) = 2°

no advance below = 325years = 1949-52

make = Austin, Austin Healey

models = 1949-1952
Austin A90 Atlantic, 1953-56 Austin Healey 100-4 BN1/2

Comments = superseded by 40495