For 1979-1989 GMC C7000 HVAC Heater Core 4 Seasons 1980 1981 1982 1983 1984 1985

1979 GMC C7000 Engine: 10.4L V8; w/o A/C; OE No. 3027247;. 1979 GMC C7000 Engine: 6.0L V8; w/o A/C; OE No. 3027247;. 1979 GMC C7000 Engine: 7.0L V8; w/o A/C; OE No. 3027247;. 1979 GMC C7000 Engine: 7.4L V8; w/o A/C; OE No. 3027247;.