The intake manifold on Vortec heads are held in place by eight 5/16-18 cap screws rather than the dozen ... With some intake manifolds, a bypass hose can be run between the water pump and the 5/8 ...

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 ...

The Vortec requires a specific Vortec intake manifold available from both GM Performance Parts and Edelbrock. On dozens of dyno-tests, we have had the most success with Edelbrock's Performer RPM ...