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2013-14 Shelby GT500
The Resurrection of "The ACCUSER"
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<blockquote data-quote="Bad Company" data-source="post: 15908894" data-attributes="member: 141815"><p>Spring bind was an issue with the first engine. The camshafts were radical with .575" lift on the intake and .566" lift on the exhaust. This put the exhaust valve spring into coil bind according to Pac Springs with the part number spring used. The new springs that JDM Engineering had designed by Pac Springs are maxed out at .550" lift on both the intake and exhaust. </p><p></p><p>JDM had Pac design the new spring for an easy installation of their Super Stock camshafts, I had nothing to do with this. The issue and the reason I believe JDM and Pac did this was so the stock valve spring retainers could be used. Prior to JDM and Pac coming out with this new spring there was only one other spring available from Pac for high lift cams in these mod motors. It required the installation of 2 different valve spring retainers to stay out of coil bind. If the installer wasn't careful he could get the retainers swapped in backwards and really go into coil bind on the exhaust valves</p></blockquote><p></p>
[QUOTE="Bad Company, post: 15908894, member: 141815"] Spring bind was an issue with the first engine. The camshafts were radical with .575" lift on the intake and .566" lift on the exhaust. This put the exhaust valve spring into coil bind according to Pac Springs with the part number spring used. The new springs that JDM Engineering had designed by Pac Springs are maxed out at .550" lift on both the intake and exhaust. JDM had Pac design the new spring for an easy installation of their Super Stock camshafts, I had nothing to do with this. The issue and the reason I believe JDM and Pac did this was so the stock valve spring retainers could be used. Prior to JDM and Pac coming out with this new spring there was only one other spring available from Pac for high lift cams in these mod motors. It required the installation of 2 different valve spring retainers to stay out of coil bind. If the installer wasn't careful he could get the retainers swapped in backwards and really go into coil bind on the exhaust valves [/QUOTE]
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2013-14 Shelby GT500
The Resurrection of "The ACCUSER"
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