Type I Engine Code Letter Ignition Timing TDC
Aug. ’60-July ’65 D 10 degrees before
Aug. ’65-July ’65 F 7.5 degrees before
Aug. ’66-July ’69 H 7.5 degrees before
Aug. ’69-July ’70 B 0 degrees TDC
From Aug. ’70 AE 5 degrees after*
From Aug. ’71 AK 5 degrees after
From Oct. ’72 AH 5 degrees after
From March ’73 AM 5 degrees after
* (From April ’73: 7.5 degrees; checked with vacuum hose off)
Type II Engine Code Letter Ignition Timing TDC
June ’60-Dec. ’62 D 10 degrees before
Jan. ’63-July ’65 G 10 degrees before
Aug. ’65-July ’67 H 7.5 degrees before
Aug. ’67-July ’70 B 0 degrees before
From Aug. ’70 AE 5 degrees after
From Aug. ’71 CB 5 degrees after*
From Aug. ’72 CD 5 degrees after**
From Nov ’73 AW 5 degrees after***
* (from Aug. ’72: 10 degrees after)
** (autostick check: 900-1000rpm)
*** (automatic trans: 5 degrees after)
Type III Engine Code Letter Ignition Timing TDC
Through July ’64 K 10 degrees before
Through July ’65 R 10 degrees before
Aug.’65-July ’67 T 7.5 degrees before
From Aug. ’67 U 5 degrees before
From Aug. ’71 X 5 degrees before