Engine Notes

ALL PRODUCTION MODELS AS OF 5/1/73 - ROCKER ARM CHANGE  - If rocker arm noise becomes excessive, there is a possibility that hard chrome rocker arm-to-camshaft sliding surface has become prematurely worn or separated from rocker arm. A new modified rocker arm is available from factory. Rocker arms are two distinct types, one for exhaust valves and one for intake valve. Care should be taken not to mix these rocker arms upon installation. New rocker arms can be installed on old rocker arm shaft, providing shaft is not worn or damaged.

ALL PRODUCTION MODELS AS OF 1/8/73 - REAR MAIN BEARING OIL SEAL CHANGE  - All production models as of January 8, 1973 (and some earlier models) are equipped with a new improved rear main bearing oil seal. New seal is equipped with threaded groove behind seal contact surface. New seal is interchangeable with old seal.