Thread sizes .

Hi all i am building a Ford 351 Windsor . I need to find out the size of the thread on the Harmonic Damper for the bolts to fix the bottom pulley on please
Can any body help me please ..John.
 

Bill Kearley

Supporter
I have a few dampers for sale !!!!!!! 3/8 inch is 9.525 mi. O, I get it, this just a game.
 
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