Reference: 1968 Dealer Service Information Bulletin 68-I-68 1967 Dealer Technical Bulletin 67-T-13
Dealer Service Information Bulletin 68-I-68 – Additional Checks to Prevent Camshaft Lobe Scuffing – OHC Six-Cylinder Engines (Ref. 67-T-13)
Reference: 1967 Dealer Technical Bulletin 67-T-13 1968 Pontiac Service Manual figure 6-18 1968 Dealer Service Information Bulletin 68-I-68A
Dealer Service Information Bulletin 68-I-61 – Revised 1968 Firebird 6-Cyl. Automatic Transmission Extension and Driveline Damper
Refer to 1968 Pontiac Diagnosis Manual Fig. 7F-3