1977 GMC C25 equipped with 7.4L V8 Gas OHV, 6.6L V8 Gas OHV, 5.7L V8 Gas OHV, 5.0L V8 Gas OHV, 4.8L L6 Gas OHV, 4.1L L6 Gas OHV
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Distributor Thermal Vacuum Switch
1977 GMC C25 equipped with 7.4L V8 Gas OHV, 6.6L V8 Gas OHV, 5.7L V8 Gas OHV, 5.0L V8 Gas OHV, 4.8L L6 Gas OHV, 4.1L L6 Gas OHV
Distributor Thermal Vacuum Switch