Original, Chevrolet Service News (technical bulletin) Volume 32 Number 4 dated April, 1960. These bulletins were released to service technicians with additional service tips after the service manuals were printed. This issue covers: trubo-air special, Corvair service, Corvair-ignition distributor ID and spec chart, passenger car turn signal control unit service procedure, painting cool pack components, truck service differential side gear maching marks and hesitation on acceleration 1960 348 Cu.In truck engines.  A little soiled and worn. Overall in good condition.