Ignition Timing

Set timing at idle speed with distributor vacuum line disconnected and opening closed.

6 Cyl. Except A.I.R.		5° BTDC
6 Cyl. With A.I.R. (1-Bbl.)		TDC
	(4-Bbl.)	5° BTDC

Fig 1: 6 Cylinder Ignition Timing Marks

Courtesy of GENERAL MOTORS COMPANY