Re: Harmonic balancers
Fred, I believe that more models of cars did get the larger balancer in '69. As noted there were some models that had the 8" earlier.
'69 was a pivotal year for Chevrolet with the Long water pump, different engine mounts, new accessory brackets with bolt holes in the ends of the heads etc.
69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1