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Home >> GMC >> 1972 >> G25/G2500 Van Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> Tune-Up - V8 >> Ignition Timing

Ignition Timing

Ignition timing is checked or adjusted with engine at normal operating temperature, distributor vacuum line disconnected and plugged, transmission in Neutral, and engine at normal idle. On "P" models, use number two cylinder and timing mark tab on bottom of engine front cover.

Ignition Timing Specifications

Application Man. Trans. Auto. Trans.
307" 4° BTDC 8° BTDC
350" 4° BTDC 8° BTDC
402" 8° BTDC 8° BTDC