67 Z small journal crank

[Denis]

I went back and checked my notes. Geez, my memory is getting as bad as my eyesight.

For the record, I pulled a 3876768 ("64-67 283 Forged" per Colvin) crank out and replaced it with the 3815822 ("67 302 Forged" per Colvin).

The 6768 crank did not have any cutouts in the otherwise circular flange whereas the 822 had the single pie-shaped cutout.

Colvin lists both the 6764 and the 6768 as 283 cranks. The 6764 crank is available either forged or cast. A 1964-dated service bulletin outlines the difference in harmonic balancer applications as follows:

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The 283" engine with a nodular iron crankshaft uses a harmonic balancer #3861968, whereas, the 283" engine with a forged steel crankshaft is produced with only a harmonic balancer hub #3795272.

In the event a forged crankshaft is used to replace a nodular iron crankshaft, the original equipment harmonic balancer #3861968 may be used as it is compatible with the forged crankshaft.


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