America's Definitive Marine Engine Magazine

marine engine digest logo

An Overview of the General Motors Vortec 4300 V-6 Marine Engine

GM Vortec 4300 marine engine

The 226 horsepower GM 4300 Vortec Marine Engine displaces 4.3-liters, or 260 cubic inches

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, all of which marinize long blocks by adding intake and exhaust manifolds, either a carburetor or fuel injection and marine grade starter and alternator. The 226 horsepower Vortec 4300 displaces 4.3 liters, or 260 cubic inches.

Vortec is the trademarked name for a line of General Motors engines