Note. Procedures for timing adjustment are for engines equipped with HEI-EST distributors only. All other models are equipped with either C(3)I, DIS or IDI ignition system. Timing on these systems is not adjustable
Note. The 3.1L Camaro and Firebird are equipped with a socket for a magnetic probe timing meter, located 9.5 degrees ATDC. DO NOT use this location for timing with a conventional timing light.