Permitted modifications supported by documented evidence. 


711M Engine Blocks. Plus 60thou overbore is allowed without altering class.

Engine Bore: 80.98mm Stroke: 77.62 = 1599cc


Standard progressive twin choke, Single / Twin, Webers or Delorto´s


Standard points or Luminition optical electronic ignition system is allowed.


Four speed standard or Rocket. Alloy or Magnesium bell housings are allowed. Dog boxes are not allowed.
Concentric Slave cylinders are not allowed.

Rear Axle.

Standard unit or 3lt Capri (Baby Atlas) Limited Slip differential. Single anti tramp bars (2 maximum) in the original manufacturers location.
The fitting of a Pan Hard Rod is permitted.
The Gartrack Grp1 semi/floating half shaft kit is allowed.
Three piece solid halfshafts.


Front. Solid or Vented brake discs with cast iron P/M16 brake calipers.

Rear. Drum brakes, Either standard or Capri. Hydraulic handbrake.

Master Cylinders.

Single outlet master cylinders may be replaced by a Tandem or Twin cylinder arrangement.

The fitting of a dual master cylinder or any other type of device providing a simultaneous action on all four wheels and divided action on two wheels is permitted, providing the original brake pedal and pivot point are used.

The remote brake bias adjuster must be positioned so that it cannot be adjusted by either the driver or co-driver when normally seated in the car.

Quick steering rack. 2.5 turns as opposed to 3.5 lock to lock.



McPherson Strut.  Large spring adjustable platform is permitted.
Alloy front wheel hubs.
Grp4 wheel studs and nuts.

Double width front anti/roll bar mountings. The fitting of an anti/dive kit is permitted.

Top Suspension mountings must be rubber bushed. Spherical bearings are permitted.


Turret kits are permitted.

Grp4 wheel studs and nuts.

Coil over shock absorbers are not permitted.

Wheels and Tyres

13″ Diameter, Rim width, Tyre size and profile as per MSA Blue book.

Switch Gear
Only period indicator stalks are allowed. You may, as was done in period rewire a indicator switch to run the wipers on the other side of the steering column


World cup cross member with engine mountings. Adjustable brake bias pedal box .
This is as long as it cannot be adjusted when the Driver or Co-Driver are normally seated.
Fibre glass bonnet and boot lid.
Composite side and rear windows.
Alloy centrally mounted replacement fuel tank.
Battery fitted in the boot. (Suitably secured and insulated.)
Front and rear steel bumpers must be fitted.
Digital display dashes and instruments are not permitted.