The 123\GB-4-R-V-POS replaces most 4 cyl. Lucas-distributors for engines in Great-British (hence ‘GB’) cars.
This unit offers “Positive earth” option. This means the unit can be used on positive earth cars. (+ of the battery connected with the chassis of the car) It is also possible to use this unit on a negative earth car.
Note that there are dedicated 123-ignitions for Mini, Jaguar & MG.
Please check if the distributor need a connection for a mechanical rev.counter, as a 123\GB-4-R-V-POS does not offer this.The unit offers a maximum total of 16 advance-curves to be selected by the end-user.
Please take a look in the table below for available advance curves.
GB4 / Mini / MG / Tune+-4-R-V-G / Tune-4-R-V-G = Suitable for Lucas 25D4 / 23D4 / 45D4
GB-4-R-V-POS = GB stands for the 123ignition type
GB-4-R-V-POS = 4 stands for the number of cylinders
GB-4-R–V-POS = R stands for straight distributor cap
GB-4-R-V-POS = V stands for vacuum advance
GB-4-R-V-POS = POS stand for positive earth