This is 1960 Chevrolet V6 Biscayne, Belair, or Impala wiring diagram. The Chevrolet 90° V6 family of engines began in 1978 as the base engine for the all new 1978 Chevrolet Malibu. These engines have a 90° vee block with 12 valves activated by a pushrod valvetrain. All engines have cast iron blocks and cylinder heads. Click the picture to download.