Engine Crank Pulley Specs??? Sheave widths?????

mangustaMember

Hey all! Having prob's with firewall bump reduction in that my water pump to crank pulley BELT is too long by a smidge.

I found that I have a crank pulley that has two sheaves (grooves) that are for 12mm belts. I suspect that I need one with a single 12mm sheave and a single 11 mm sheave like almost 100% of Ford pulleys ever built! I suspect a manufacturing hose up!

Is there anyone with an engine on a stand or with a box of parts that can measure the stock crank pulley sheaves and see if I am simply "Murphy" lucky to draw the short straw again with this project????????

I have a 74 car, with 5.5" pulleys water pump and crank. They appear to be stock cast pieces.

Thanks in advance for your help!!!!
Steve

3/30/224:13 PM

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