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Home >> Mercury >> 1968 >> Cyclone 7.0L Eng VIN R, Not Available Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Tune-Up - V8 >> Engine Identification >> Ignition Timing

Ignition Timing

Set timing at idle speed with distributor vacuum line disconnected.

Ignition Timing Specifications

Engine (1) Emission Non-Emission
302" 6° BTDC 6° BTDC
390" Except GT 6° BTDC 10° BTDC
  GT 6° BTDC 12° BTDC
427" 6° BTDC  
428" 6° BTDC 10° BTDC
  Police 6° BTDC 12° BTDC
(1) Exhaust Emission (Thermactor or IMCO) is used on all U.S. Cars.