Ignition Timing

Engine must be at operating temperature. Connect timing light to engine. Connect tachometer to negative terminal of coil, engine check connector, or remove rubber cap and connect probe to service connector on distributor (if equipped). See Fig 3.
CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tach to system. Do not allow tachometer terminal to become grounded. This can damage igniter and/or coil.
Adjust idle speed to specifications. Install jumper wire across terminals of engine check connector (if equipped). See Fig 1.
Disconnect and plug both distributor vacuum hoses. Adjust timing by turning distributor.

Fig 1: Ignition Timing Adjustment

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Fig 2: Van Firing Order & Distributor Rotation

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IGNITION TIMING SPECIFICATIONS (DEGREES BTDC @ RPM)

Timing Vac. Plugged	Timing Vac. Connected
8 @ 950	20 @ 950

Fig 3: Tach Hook-Up, Idle Speed & Ignition Timing Adjustments

Fig 4: Ignition Timing Marks