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Home >> Chevrolet >> 1974 >> Forward Control 4.8L Eng VIN T, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Specifications >> Tune-Up - 6 CYL >> Ignition Timing

Ignition Timing

Ignition timing is checked or adjusted with engine at normal operating temperature, distributor vacuum line disconnected and plugged, manual transmission in Neutral, automatic transmission in "D" and engine at normal idle.

Ignition Timing Specifications

Application Timing
250" Light Duty All, Federal 8° BTDC
250" Light Duty, California
  Man. Trans. (1)
  Auto. Trans. 8° BTDC
250" Heavy Duty, All 6° BTDC
292" Heavy Duty, All 8° BTDC
(1) Not available.