Trick Flow Street Heat heads, not to be confused with the Twisted Wedge or Track Heat. These are the first generation head that's given credit for helping ignite the 5.0 revolution. They were also the first unofficial Pro 5.0 head, used by early Mustang racers like Stormin Norman, Gene Deputy, Craig Radovich, Ronnie Crawford, and Don Walsh Sr.
The vintage design was sold to Will Burt Automotive. A few years ago, TFS bought back the design and now they've been reborn as the High Port.
These heads outperform the Twisted Wedge heads. The Street Heat High Port heads have 195cc intake ports and 87cc exhaust, making them serious horsepower makers. CNC port them and they make even more power, even more than the R series head.
Easily identified by the trapezoid shaped exhaust port, no other head has this feature.