Permitted modifications supported by documented evidence.


850, 970, 998, 1071, 1098, 1275.

Due to the shortage of Mini Cooper ´S´ blocks, the Solid tappet chest 1275GT block will be allowed.

The ‘A’ Plus block is permitted. The ‘A’ Plus is identified by the strengthening webbing visible on the front of the block below the distributor mounting hole.

12G940 casting 1275cc cylinder heads. Arden or Weslake 8 port cylinder heads.

A crankshaft with C-shape counterbalance webs is not permitted.

Electronic ignition.

Lumenition Optronic replacement system.


Single Weber or Delorto. Split Weber configuration allowed. Twin 1.25, 1.5, 1.75 S U´s (Not later H I F type) Amals or twin Forty DCOE carburetors on 8 port cylinder head configuration..


Three or Four syncromesh. 
Limited slip differential. Straight cut drop gears. 

A dog engagement gearbox is not permitted.

The starter motor must be of the inertia type. NOT pre engaged. The period modification was to fit a 10 tooth pinion as opposed to the 9, this gave a greater turn speed of the engine.


Front. Minifin brake drums. Solid 7.5 or 8.4 inch brake disc.
Rear: Cast Iron or Minifin brake drums.

Tandem master cylinder. Adjustable brake pedal box. As long as it cannot be adjusted by driver or navigator when normally seated. The KAD adjustable pedal box assembly is acceptable.
The later Rover Mini assembly which incorporates an in line servo is also permitted.


The original 2 bolt/stud tower subframe may be replaced by the later single large bolt type.
Adjustable Hi Lo´s. Solid negative camber bottom arms (Not rose joints). Adjustable tie bars. (Not rose joints)
Beam axle with coil over shock absorbers. Adjustable Hi Lo´s. Non adjustable camber brackets.

If adjustable camber brackets are used, they must be set and then welded in that position.

Rear anti/roll bar.

Wheels and Tyres.

Ten or Twelve inch wheel rims

Width and tyres as per MSUK Blue book.


Fibre glass bonnet or boot lid. Composite side windows.

Wind up one piece  front side windows may be replaced with two piece slider windows. (As mark one Mini)

Alloy doors or skins, centrally mounted replacement petrol tank.

Twin Steel petrol tanks.

Front and rear bumpers must be fitted.