by David Franchi in the December 2007 RootesReview:
The crankshaft pulley for a Tiger is Rootes part number 6100031, Ford part number is C4JZ-6312-A. Only industrial Ford Truck dealers could order this part about 20 years ago. You won’t find this pulley on anything but a Tiger or an old Ford industrial engine.
The overall diameter is about 6-1/16”; depth from face to rear is 1-7/16”; and from the center of the belt groove to the rear mounting surface is 1-1/8″.