GM Vortec HO 3000 I-4
General Motors Marine Engines
Vortec is the trademarked name for a line of General Motors engines. The Vortec trademark first appeared back in 1988 on a 4.3-Liter, V-6 gas engine that created a vortex of swirling air and fuel in its combustion chambers promoting a better mix of air/fuel.
The crate engines are sold to Volvo Penta, MerCruiser, Indmar, and PleasureCraft Marine, who marinize long blocks by adding intake and exhaust manifolds, either a carburetor or fuel injection and marine grade starter and alternator. The 142-horsepower, four-cylinder Vortec displaces 3.0 liters, or 181 cubic inches.