Year: 1967-69
Model: Mustang/Shelby/Cougar
Engine: 390, 428 S/CJ
Finish: Zinc bolt and zinc dichromate toothed lock washer
Bolt Thread Size: 1/2-13
Quantity: 1 bolt, 1 lock washer

Jack's Comments:

This is the correct bolt and locking toothed lock washer for all big block FE engines.  Finish specifications are verified in assembly manuals.

Concours Notes:
The lock washer should be sandwiched between the engine block and ground cable terminal (see assembly manuals).