1981 GMC K3500 Engine: 5.7L V8;FuelSystem: 4BBL; Composite;. 1981 GMC K3500 Engine: 7.4L V8;FuelSystem: 4BBL; Composite;. 1982 GMC K3500 Engine: 5.7L V8;FuelSystem: 4BBL; Composite;. 1982 GMC K3500 Engine: 7.4L V8;FuelSystem: 4BBL; Composite;.
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