1978 GMC C35 5.0L V8. 1976-1978 GMC C35 6.6L V8. 1975-1978 GMC C35 5.7L V8. Contents: Contains Intake Manifold Gaskets, Intake Manifold End Seals, Distributer Mounting Gaskets, RTV. Notes: Engine Intake Manifold Gasket Set -- Contains one crossover restrictor; Composite.