What are the major differences between the Trick Flow Street Heat, the Track Heat, and the Twisted Wedge heads?
To keep this simple, the Street Heat is the original designed inline valve high port head. The Track Heat and Twisted Wedge heads are basically the same (same exact castings) with the exceptions that the Twisted Wedge heads have smog provisions and valve springs for up to .520″ lift, while the Track Heat heads have no smog provisions and come with springs for up to .600″ lift.