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Chevrolet began using the double hump cylinder head design on its small block engines in 1962. While they weren't included on every Chevy with a small block V8, they were common enough to ensure a ...
Why'd we choose the Vortec heads? Cost is the reason. A complete set of iron Vortecs (GMPP PN 12558060) will cost you just $477.50 plus freight from Scoggin-Dickey Chevrolet.