HQ Holden racing Specifications

The 'HQ Holden' Category is a tightly restricted category with the aim of producing close racing on a smaller budget. Many items including the Engine, Gearbox and Differential must be sealed by an Approved Sealer, using specially coded and numbered seals, before they can be used.

See below for a brief list of restrictions on all the major components.

ENGINE
202 Red motor - max.0.060" oversize. WADE 933 controlled camshaft. Standard crankshaft and conrods. Engine may be balanced and blueprinted. Cast pistons only. As from the beginning of 2010, the Combustion Chamber size will also be restricted to 45cc. Sump may be baffled.
(Engine must be sealed)

CYLINDER HEAD
Valve springs free, but only one per valve (no double valve springs). Valves free, subject to a maximum head size of - Exhaust 1.375" - inlet 1.675". Valve lifters free - must be hydraulic operation and a maximum diameter of .8428.
(Head must be sealed)

GEAR BOX
Standard HQ 3-speed manual gearbox. Floor shift may be fitted.
(Gear Box must be sealed)

CLUTCH
Method of actuation is free. One ton clutch assembly may be fitted.

DIFFERENTIAL
Standard non-limited slip Banjo or Salisbury 3.55 to 1 ratio.
(Diff must be sealed)

FUEL
Must be pump fuel, Premium Unleaded as purchased from a local service station. No additives allowed.

CARBURETTOR
One only standard 202 red motor Single Barrel Stromberg carby. Jets are free. Air cleaner - Speco HQ 900 AC Housing (controlled item), but element is free

EXHAUST
Exhaust system is free from cylinder head exit.

COOLING SYSTEM
Radiator is free but must bolt to original holes. Electric fan may be used.

WEIGHT
1365kg (minimum race weight including Driver)

WHEELS & TYRES
14" x 7" or 14 x 8" Rims, 225/65R14 Kumho Powermax 769 Tyres

WHEEL ALIGNMENT
The camber on each front wheel must not exceed 3 degrees negative. The rear wheel camber must not exceed 0, plus or minus, 1 degree negative.

BRAKES
Front disc PBR or Girlock. Drum type rear. Lining material free. Brake hoses may be replaced with those of aeronautical standard.

SUSPENSION
All mounting points must be in original position. All bushings must remain original (rubber). Suspension components are strictly controlled by use of "Pedders HQ Racing Kit", obtained from any Pedders store.