1987 Chevrolet R20 Engine: 4.3L V6; High Blower Relay Silver;. 1987 Chevrolet R20 Engine: 4.8L L6; High Blower Relay Silver;. 1987 Chevrolet R20 Engine: 5.0L V8; High Blower Relay Silver;. 1987 Chevrolet R20 Engine: 5.7L V8; High Blower Relay Silver;.
