Hey guys , so I’m very new here but I had a 97 f150 5.4 given to me, the engine was completely apart but I am a engine guru junky so I did what any junky would do and put it back together but with new heads , new almost everything . But now I have a issue. The guy who took it apart did not save the bolts which was not a problem until I got to the crankshaft / harmonic balancer pulley. The bolt that mounts it to the shaft I can not find anywhere, no parts store, I called my Ford dealer and they don’t even offer it with or without buying a new harmonic. I can not find the size or a spec sheets on the bolt. I believe it is 12 mm x 150 and 1.8 . But idk and don’t want to risk cross threading or messing up threads, so please someone confirm it’s that size.

 

18mm Socket, M12 x 1.50 Thread Size, 1.800 Under Head Length, plus washer required:

https://www.jegs.com/i/ARP/070/156-2501/10002/-1

https://www.cnc-motorsports.com/arp-...501-50879.html

 

I have seen both articles you shared and in their vehicle figment guides it does not have my vehicle. That is why I am not 100%,