What makes Vortec heads any different from other GM steel heads? Instantly the HP rating increased 55HP to 255 HP primarily from the power of these cylinder heads. These newly designed for 1996, state of the art heads are made from cast iron and replaced the former swirl-port TBI heads that had been previously used on the GM truck 350. What exactly are 'Vortec heads'?īeginning in 1996 to '00, L-31 Vortec heads were installed from the factory on GM truck and van 350 engines. So - without any further ado, I'll start things off. The idea is for anyone with Vortec experience and/or info to post here in this thread so as to pool our Vortec knowledge. I'm sure anyone interested in Vortec heads will find this thread to be quite useful and informative for their own Vortec engine build and questions concerning using the same.
