Edelbrock Performer GM Corp V-6Edelbrock part #5486 Performer Buick V6 intake manifold is designed for 1979 and later street 231 252 c. i. d. (252 c. i. d. 1980 84 only) Buick V6 engines with late model cylinder heads. Manifold will not fit pre 1979 engines. Manifold not equipped with EGR. Not compatible with C 3 and C 4 electronic fuel management systems. This Part Fits: Year Make Model Submodel 1975 1977 Buick Century Base 1975 1979 Buick Century Custom 1978 1979 Buick Century