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Checking and Adjusting Ignition Timing

Set timing to specifications given in tune-up charts. With engine warm, set engine speed to 850 RPM (1968-70) or 900 RPM (1971-73). Connect timing light to number one cylinder and disconnect vacuum hose connected on 1968-70 models, leave hose connected on 1971-73 models. Rotate distributor to achieve correct timing.