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Message: <blockquote data-quote="TrickVert" data-source="post: 1496180" data-attributes="member: 8315">Welcome, and certainly a nice deal!When you say "HP" heads, are you referring to the four-bar GT40-P heads?  If so, then yes, special headers are needed.  If they're standard GT40 heads (three-bar), then any standard header will work fine. Mine are P's, and I have MAC P-specific headers that are unfortunately no longer sold. I'm not sure what might still be available today, but know it's becoming an issue.  Some people say you need 90° boots for the plug wires, but I found that 45° work well on mine, although I did add fiberglass sleeves to keep the wires off the header if/when they shift position.Good luck with the project!EDIT:  This might be helpful... (from <a href="https://lmr.com/products/what-are-gt40-heads-mustang" target="_blank">THIS LINK</a>)<h4>WHICH VEHICLES HAD GT40 HEADS?</h4> <ul> <li data-xf-list-type="ul">1993-1995 Mustang Cobra | Part# F3ZE or F4ZE</li> <li data-xf-list-type="ul">1996-Mid 1997 Ford Explorer & Mountaineer SUV | Part# F1ZE-AA</li> <li data-xf-list-type="ul">1993-1995 Ford F-150 Lightning | Part# F3ZE or F4ZE</li> </ul>The GT40 heads can be found specifically on the 1993-1995 SVT Cobra Mustang as well as the 1993-1995 SVT Lightning. These can also be found on the 1996-Mid 1997 Ford Explorer & Mercury Mountaineer SUV.WHICH VEHICLES HAD GT40P HEADS?<ul> <li data-xf-list-type="ul">Mid 1997+ Explorer/Mountaineer SUV Models | Part# F77E-AA</li> </ul></blockquote>