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Developed from the budget Road Runner, the Superbird was designed to defeat Ford's Talladegas in NASCAR superspeedway races. Shortly after Plymouth's powerful rocket appeared, NASCAR had changed the rules, and Superbirds were only allowed to race the 1970 season.
Construction: cast-iron block and heads; hemispherical combustion chambers
Valve gear: 2 valves per cylinder operated by a single camshaft, pushrods and rockers
Bore & Stroke: 4.25in x 3.74in
Displacement: 426 cubic inch
Compression Ratio: 12:1
Induction System: Two 4-barrel carb, aluminum manifold
Maximum Power: 425 bhp at 5,000 rpm
Maximum torque: 490 lb-ft at 4,000 rpm
TorqueFlite 3-speed automatic plus torque converter or Mopar 883 four-speed manual
Steel channel chasis welded to body with bolted front subframe
Steering: Recirculating ball, power-assisted on road cars
Front suspension: Double wishbones wth torsion bars, telescopic shock absorbers
Rear suspension: Live axle with asymmetric leaf-springs, telescopic shock absorbers
Brakes: Vented discs 11 in. dia. (front), drums 11 in. dia. (rear)
Wheels: Steel disc 7 in. x 15-in..
Tires: Goodyear 7.00/15
Length: 218 inches
Width: 76.4 inches
Height: 59.4 inches
Wheelbase: 116 inches
Track: 59.7 inches (front), 58.7 inches (rear)
Weight: 3,841 lbs.
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