Permitted modifications supported by documented evidence. 


1.6, 1.8 cast iron or 2lt Alloy Blocks. Dry sump lubrication system. BDA cylinder head. Not BDG. Ten, twelve and fourteen ml spark plugs are allowed as long as the distance between the inlet valve stems is 1.5inch. Three or Four bolt exhaust manifold to cylinder head fixings.

Plus 60thou overbore is allowed without altering class.

BDA 2lt Cylinder blocks (1975cc)

Bore 90mm. Stroke 77.62mm 

5.230″ (13.2842mm) Connecting rod length.

Only “I” section connecting rods are permitted.

Due to the shortage of the above blocks the Burton engineering or Quaiffe reproduced castings will be allowed. These must however only have two bolt main bearing caps.

The water pump may be driven by the flank of the camshaft drive belt.

Twin, Weber or Delorto´s
Mechanical fuel injection.

Lucas or Lumenition. The Lucas constant energy system is available from John Wilcox Engineering (01455230576) The Lumenition system uses an Optronic Trigger system and is an alternative to the Lucas system. It is good to 13000RPM! Both systems ignition pack and coil must be mounted on the inner wing. Lucas or Bosch distributors are permitted.


12 or 24V Starter motor circuit. Alternator on Poli V or normal V profile drive belt.


Four speed 2000E or Rocket gearboxes are permitted.

An Alloy casing for 4 speed gearboxes are permitted.

The ZF S5-18/3 is the only 5 speed gearbox permitted.

Dog engagement gearboxes are not permitted.
Concentric Slave cylinders are not permitted.

Rear Axle.

Standard unit or fully floating Atlas unit. Alternatively the Quaife English axle kit Pt no QAF4Z can be used. Limited slip differential. Full 5 link axle location. Only short links are allowed. (Approximately 16.5 inches long).
Watts linkage is  permitted.
The fitting of Coil over springs is allowed, however as in period a leaf spring must also be fitted. The Ford works team I am lead to believe used a plastic look alike spring to satisfy the rules.
Three piece solid halfshafts.


Front. Standard or vented brake disc with AP racing or Girling alloy 4 pot brake calipers.

AP Racing CP2361 (Forestry) or CP2270 (Monte Carlo) front brake calipers.
Rear. Drum brakes, either standard or Capri 3lt. (Baby Atlas). Alternatively non vented disc brakes. Single calipers must have a period design mechanical hand brake mechanism built into it. (Not Sierra). Otherwise two single calipers. One for foot brake and one for the hydraulic hand brake.

AP racing have reproduced the CP2383 rear brake caliper. However two CP2577 calipers, one for foot brake and one for handbrake are acceptable. Ian Rix engineering (01379854387) are marketing a modified CP2577 caliper with a built in mechanical handbrake mechanism to satisfy the MOT/road traffic act. This unit is accepted for use but will still require a separate footbrake caliper
Girling alloy brake caliper information is available from John Freeth on 01600713117 or

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 Struts. Adjustable platforms are allowed as long as they are the large (Standard) diameter spring. Double width front anti/roll bar mountings. Tarmac spec Compression strut configuration allowed. One piece solid Track Control Arm’s.
Tension Struts are not permitted.

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

Turret kits (Any height) are allowed.  Standard Leaf springs with shackle or slipper type of attachment.
Adjustable platform shock absorbers are permitted

Wheels and Tyres
13 or 15 inch wheel.

Rim width, tyre size and aspect ratio as per MSUK 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 .

Body Shell

The Centre tunnel can be enlarged at the front bulkhead area to assist gearbox removal.
The recessing of the floor pan to accomodate the exhaust system is not permitted.

The rear wheel arches may be enlarged to accomodate the fitment of 15″ wheels.


World cup cross member with engine mountings.
Fibre glass bonnet and boot lid.
Composite side and rear windows.
Alloy centrally mounted replacement fuel tank.
Battery fitted under the bonnet or in the boot. (Suitably secured and insulated.)
Front and rear Steel bumpers must be fitted.

Heated front windscreens are permitted.

Digital display dashes and instruments are not permitted.