1987 Chevrolet R30 Engine: 4.8L L6; High Blower Relay Silver;. 1987 Chevrolet R30 Engine: 5.7L V8; High Blower Relay Silver;. 1987 Chevrolet R30 Engine: 6.2L V8; High Blower Relay Silver;. 1987 Chevrolet R30 Engine: 7.4L V8; High Blower Relay Silver;.
