my intake manifold won't work!'" Customers re-drilled the Vortec heads for the conventional small-block Chevy intake bolt pattern and ran into trouble when they tried to bolt on their factory GM ...

The intake ports won't align. The higher ports on the heads result in a gap between them and the top of the manifold runners. Vortec ManifoldsWhy GM Performance elected to put the early bolt ...

It didn't used to be so easy. The history of hassles stems from the fact GM used different intake manifolds and front dress on the light truck / SUV based Vortec engines than it did on non-Vortec ...

However, one GM platform big block Vortec engine held its own ... GM also added an LS-style intake manifold to the 496 to cement its footing in the modern world while taking the title as one ...