2124 I L cusvnum MODEL REFERENCE i 1977 ROCHESTER 4BC Follow procedure outlined below to determine carburetor and or part number 1 Determine vehicle model 2 Determine engine and carburetor type 3 Part number can be determined by cross referencing corresponding column with same column number on chart I PRODUCTION USAGE COL NO 17057202 All w A T 350L exc C60 Federal 2 l 17057204 All w A T w C60 350L Federal 3 17057502 All w A T 350L exc C60 Calif 4 7 w 17057504 All wIA T wIC60 350L Calif 5 l I 17057582 All wIA T 350L exc C60 Alt 0 6 l 17057584 All wIA T WICBO 350L Alt 7 17057203 F X wIM T 350L 1 i A l l l l l l I l l GM PARTS DIVISION GENERAL MOTORS CORPORATlON CHEVROLET 10 REV 9 80 3 61 c 3 000 GROUP