Part Type: Carburetor Mounting Gasket. Carburetor Gasket. 1957 GMC 250 Engine: 5.7L V8; without Governor; Insulator to spacer;. 1959 GMC 250 Engine: 5.5L V8; without Governor; Insulator to spacer;. 1958 GMC 250 Engine: 5.5L V8; without Governor; Insulator to spacer;.
