1973-1974 Chevrolet K20 Pickup V8 5.7L 12si High Output Alternator Pulley:6-Rib Serpentine Pulley This is a direct fit

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then 4GA is plenty

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1973-1974 Chevrolet K20 Pickup V8 5.7L 12si High Output Alternator Pulley:6-Rib Serpentine Pulley This is a direct fitFitment: This is a direct fit high output alternator for the 1973 1974 Chevrolet K20 Pickup 5. 7L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a separate adaptor plug. One side will plug directly into the aftermarket high output alternator, and the other side will plug into the factory plug. NOTE: If you require charging at a certain voltage setpoint, we offer a