Feb 23, 2011 ยท SlyFox512. My mustang made 290RWHP and 306TQ on a dyno jet. I was expecting to be at least 315-330 any ideas what's holding me back. I have trick flow 170cc track heat heads w 1.7 Rr, b cam, unported weiand stealth intake, holley 650 dp. The heads were milled to a 58cc combustion chamber and the timing was set to trick flows specifications, the .... "/>