The Vortec requires a specific Vortec intake manifold available from both GM Performance Parts and Edelbrock. On dozens of dyno-tests, ... Since this is an OEM iron head, ...

Follow along and we'll show you how Gruben added 40-plus horsepower to his '89 Firebird with a set of inexpensive cast-iron Vortec heads, courtesy of a new Vortec/TPI intake manifold. You can do ...

Here is how you can build a 447 horsepower Vortec small-block ... sharing many features with the excellent OEM Vortec ... we went with a Professional Products Crosswind two-plane intake manifold.