Vortec heads only appear on production trucks they were never used in passenger cars. However your pontiac can have a choice of several heads ranging from the swirl port to. The dart iron eagle ss vortec seems like the best value in iron vortec heads, with flow numbers pretty close to stock, but allowing for higher lift without machining or special. The cast iron vortec heads was one of the first to purposely integrate tumble instead of large swirl numbers in the design. What got the performance enthusiast’s attention.
Built of cast iron, these powerhouse heads upped the horsepower of. So, how much does it cost to build a 350 engine anyway? We have a couple vortec headed 350's in trucks here on the farm, very reliable, make good power, and no cracking as of yet. One of the two i put together when i was a.