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Ignition Timing

Set timing at idle speed with distributor vacuum line disconnected and plugged.

Engine Synchro-mesh Auto. Trans.
302" 4° BTDC  
307" 2° BTDC 2° BTDC
327" 210 HP 2° ATDC 2° BTDC
  250 HP 4° BTDC 4° BTDC
  275 HP TDC 4° BTDC
  300 HP 4° BTDC 4° BTDC
  325 HP (1)   4° BTDC.
  (2) 8° BTDC  
  350 HP (3) 4° BTDC  
350" TDC 4° BTDC
396" 325 HP 4° BTDC 4° BTDC
  350 HP TDC 4° BTDC
  375 HP 4° BTDC  
427" 385, 390, 400 HP 4° BTDC 4° BTDC
  425 HP 4° BTDC  
  430 HP 12° BTDC  
  435 HP 4° BTDC  
(1) Distributor No. 1111444.
(2) Distributor No. 1111478.
(3) Except Distributor No.'s 1111475, 477 which are set at 8° BTDC.
Fig 1: Ignition Timing Marks (All Engines)
G09362443Courtesy of GENERAL MOTORS COMPANY
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