This is the short list of origianl type Lucas duistributors (and specifications) you may find in the MGA.

LUCAS Distributors for MGA Service ECM Advance1 Advance2 Advance3 vacuum number Model rot'n curve RPM 1 ± 1° RPM 2 ± 1° RPM 3 ± 1° code Connection years make models 40448 DM2. CCW 1957 MG MGA 40510B/D/F DM2P4 CCW 546 12.25 7-14-10 1956-59 MG 1956-59 MGA 1500 1959-62 MGA 1600 40718A 23D4 CCW 710 3500 13 1800 10 700 7.5 250 No vacuum 1959-61 MG MGA Twincam replaces 40510 40897A 25D4 CCW 2500 17 1100 9 475 2 220 MG early MGB

For a list of all known Lucas distruibutors see next page.

There will be some confusion when refering to the direction of rotation of the distributor. Lucas technical manuals go to some length to note that distributor rotational direction is as viewed from the driven end. That being the case all MGA (including Twin Cam) and MGB disributors have clockwise rotation. However, most of us mechanical types who need to service the car regularly will most often be looking at the top end of the distributor, in which case it turns counter-clockwise.