![]() L-31 Vortecs came in two castings, #906 and #062. Such a unique cylinder head design has become popular among enthusiasts interested in their own budget, small block engine builds. The biggest design shift from prior iron GM heads is the combustion chamber, built in a ‘double-quench’ style. Some circles believe the Vortec L-31’s small exhaust port is easier to work than intake, making it an excellent choice for split-duration camshafts. 300”-.500” valve lift area, wide bowl, and back-cut intake valve and exhaust. This is primarily attributed to the high port flow in the. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. Vortecs are highly prized among many van and truck enthusiasts, as they are among the best budget options for their time.įrom 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Nowadays, this technology is used on a wide range of engines. The name first appeared in a 1984 advertisement for the 4.3 L V6 that used “vortex technology” to produce a swirl inside the combustion chamber that allowed for better air/fuel flow. ![]() Vortec gets its name from a line of small block engines for GM trucks.
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