Here is one of the essential puzzle pieces to running a VS57 McCulloch supercharger on your ford flathead V8. Our VS57 supercharger crank pulley.
This piece is precision CNC turned from a solid piece of 6061 Aluminum guaranteeing its concentricity.
It's outer diameter measures 7 1/2"
This can be used as a direct replacement of the original crankshaft pulley on all 24 stud flathead ford v8s, with the addition of the front v groove used to drive the supercharger.