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Car Specifications

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MGB ROADSTER 72-74
Vehicle Identification
Vin Plate
Vehicle Number Location
Body Number Location
Engine Number Location
Gearbox Number Location
Tune Up
Rear Axle Number Location
Engine Firing Order
Valve Rocker Clearance.015 in (.38 mm ) cold
Idle Speed850 rpm
Static Ignition Timing
Dynamic Ignition Timing1971-1972 - 16º BTDC @ 1500 rpm; 1973-1974 - 11º BTDC @ 1500 rpm
Timing Mark LocationNotch on crankshaft pulley, pointers on timing chain cover
Distributor Make/Type
Contact Breaker (points) Gap.014 to .016 in (.36 to .41 mm)
Rotation of Rotoranti-clockwise
Dwell Angle60 +/-3 degrees
Ignition Coil Make/TypeLucas 12 volt
Primary Resistance
Spark Plug Make/TypeChampion N-9Y
Spark Plug Gap.025 in (.64 mm)
Carburetor Make/TypeTwin SU HIF4
Carburetor Main Jet.090"
Carburetor Main Jet NeedleAAU, ABD
Carburetor Piston Spring
Vehicle & Engine
Length12 ft 8 1/2 in (3.8 m), 12 ft 9 3/16 in (3.89 m) w/ overriders
Width4 ft 11 15/16 in (152.3 cm)
Height4 ft 1 3/8 in (125.4 cm)
Ground Clearance5 in (12.7 cm) min.
Track Front4 ft 1 in (124.4 cm)
Track Rear4 ft 1 1/4 in (125 cm)
Wheelbase7 ft 7 in (231.1 cm)
Turning Circle32 ft (9.75 m)
Toe-In1/16 to 3/32 in (1.5 to 2.3 mm)
Unladen Weight2303 lb (1044 kg)
Curb Weight2653 lb (1203 kg)
Gross Weight2753 lb (1249 kg) max
Original Tire Size165-14
Original Tire Pressure Front (Cold)
Original Tire Pressure Rear (Cold)
Replacement Tire Size165SR-14
Engine Type
Engine Displacement1798 cc (109.8 ci)
Firing Order1, 3, 4, 2
Compresssion Ratio8.0:1
Engine Bore3.16 in (80.26 mm)
Engine Stroke3.5 in (89 mm)
Number of Cylinders4
Oil Pressure Idle10 to 25 lb/in2 (.7 to 1.
Oil Pressure Normal50 to 80 lb/in2 (3.5 to 5.6 kg/cm2)
Ignition Typepoints
Fuel System Type
Fuel Pump Make/TypeSU type AUF 300 electric
Fuel Tank Capacity12 gal, 14 gal with evaporative loss system
Cooling System Capacity11.4 pints w/o heater, 12 pints w/ heater
Sump CapacityEarly cars -- 9 pints, 9.6 pints w/ oil cooler; late cars -- 6 pints, 7 1/4 pints w/ oil cooler
Gearbox Capacity, non-overdrive6 pints
Gearbox Capacity, overdrive7 pints
Gearbox Capacity, automatic

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