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 TPI intake.

Our core, purchased from AA Midwest, is a late-model truck Vortec or Gen II small-block 350. GM sufficiently refined the engine package to offer many improvements in quality.

Q: Will Late 350 Chevy TBI Heads Work on a Carbureted '70s Short-Block? A: I have a '72 350 Chevy engine without the original heads.

The Vortec head significantly outflows their non-Vortec service replacement head and offers a 20-40 hp increase over earlier cast-iron heads.