1977-79 Models

With engine idling at normal operating temperature, adjust ignition timing to specifications. Vacuum hose should be connected to distributor. Appropriate mark on pulley should be aligned with mark on blower housing. See Fig 2.

1974 76 IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
1974-75 Models
	Base	900	5°ATDC
	Advance	6000	35°BTDC
1976 Models
	911S	850-950	5°ATDC
	Turbo Carrera	900-1000	2-8°ATDC

1977 IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
911S
	Federal	950-1000	TDC
	Calif.	1000	15°ATDC
Turbo Carrera		950-1050	7°ATDC

1978-79 IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
911SC		900-1000	5°BTDC
Turbo
	Federal	950-1050	10°ATDC
	California	950-1050	5°ATDC

Fig 1: Carrera, 911 & 911SC Ignition Timing Marks

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Turbo Ignition Timing Marks

Courtesy of PORSCHE CARS NORTH AMERICA, INC.