1- Early 1949, IGN mark. Late 1949 and
1950-54, first line to come under pointer
is for standard heads , second line for
high compression heads, third line is
2- Center of three lines
3-Turn Adjusting screw in, until engine
misfires, then back off screw (ccw) 1/2 turn.
4- Cylinder numbering (front to rear): Left
bank 1-3-5-7 Right bank 2-4-6-8.
5-First line to come under pointer while