HQ Car Specifications
BODY:
1971-74 HQ Holden 4 Door
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. Compression ratio free.
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.
FUEL:
A Commercial Fuel, with a maximum ethanol content of 10%. Pump Fuel shall be available for sale on demand from a roadside retail bowser outlet at each of at least five separate service stations in each of at least three Australian States. A mixture of Pump Fuels with the same hydrocarbon profile is permitted (eg, brands of unleaded petrol (ULP) may be mixed; 10% ethanol-blended fuels and ULP may not be mixed, lead replacement additives as per cams rule book).
CARBURETTOR:
One only standard 202 red motor Stromberg carby. Jets are free.
Air cleaner – Speco HQ 900 AC (controlled item)
EXHAUST:
Exhaust system is free from cylinder head exit.
COOLING:
Radiator free but must bolt to original holes. Electric fan may be used.
WEIGHT:
1365kg (minimum race weight)
WHEELS:
14″x 7″ or 14″x 8″ mags or steel rims.
TYRES:
Kenda Klever H/P KR 15 P235/60R1496H.
WHEEL ALIGNMENT:
The camber on each front wheel must not exceed 3° negative.
The rear wheel camber must not exceed 0° ± 1° negative.
GEARBOX:
Standard HQ 3-speed manual gearbox (must be sealed).
Floor shift may be fitted.
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. (must be sealed)
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.
