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 ...

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 ...

The manifold base uses larger intake runners to take advantage of the Vortec’s excellent intake port flow. The manifold is designed to accept either stock TPI runners or the larger, high ...