ENGINE INSTALLATION INSTRUCTIONS PART N0 3933939 GENERAL INFORMATION C ont d 4 When using on powerglide models remove clutch pilot bushing 5 Models with optional equipment require transfer or replacement of engine parts special to such options 6 II any part number listed above is not shown in the current master parts catalog check history section for replacing part number 7 On 1966 models it may be necessary to rework the sheet metal in the oil cooler area to provide clearance I 1969 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 30C 49