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SVT Shelby GT500
Check your lower pulley bolt.....Pics
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<blockquote data-quote="19COBRA93" data-source="post: 14009781" data-attributes="member: 10462"><p>The factory bolt needs to be torqued to the factory settings. </p><p></p><p>Which should be;</p><p></p><p></p><p> </p><p></p><p></p><p></p><p></p><p></p><p>As for ARP, they don't make one specifically for the GT500 5.4L. But, ARP part number 674-1010 is a perfect fit. They come in a pack of 5, and are inexpensive (and you get 4 extras!). They're 8740 chromoly, and the size is M12 X 1.50 X 90mm. The clamping force with this bolt is substantially more than the OEM TTY bolt. The tighter the bolt, the less load there is on the snout/keyway. I'm running this bolt (with an ARP washer) in my crank with my 4.0L.</p><p></p><p>Even with a double keyed crank, you still need a tight clamping force to transfer that energy away from the end of the snout and towards the main journal of the crank.</p><p></p><p></p><p>As for the OP, that sucks. But, IMO, a properly torqued OEM crank bolt will never come loose on it's own. I don't think your bolt backed out, I think there just wasn't/isn't enough clamping force with the OEM bolt when run with a big supercharger. It places too much load on the key/keyway.</p></blockquote><p></p>
[QUOTE="19COBRA93, post: 14009781, member: 10462"] The factory bolt needs to be torqued to the factory settings. Which should be; As for ARP, they don't make one specifically for the GT500 5.4L. But, ARP part number 674-1010 is a perfect fit. They come in a pack of 5, and are inexpensive (and you get 4 extras!). They're 8740 chromoly, and the size is M12 X 1.50 X 90mm. The clamping force with this bolt is substantially more than the OEM TTY bolt. The tighter the bolt, the less load there is on the snout/keyway. I'm running this bolt (with an ARP washer) in my crank with my 4.0L. Even with a double keyed crank, you still need a tight clamping force to transfer that energy away from the end of the snout and towards the main journal of the crank. As for the OP, that sucks. But, IMO, a properly torqued OEM crank bolt will never come loose on it's own. I don't think your bolt backed out, I think there just wasn't/isn't enough clamping force with the OEM bolt when run with a big supercharger. It places too much load on the key/keyway. [/QUOTE]
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SVT Shelby GT500
Check your lower pulley bolt.....Pics
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