Isuzu 6H engine

The Isuzu 6H is a family of inline six-cylinder diesel engines built for medium-duty trucks. Isuzu fitted it to its own F-Series and H-Series trucks, and General Motors used the same engine in its medium-duty Chevrolet T-Series trucks under the name Duramax LG4. It is paired with the Allison 2500, 3000 and 3500 series automatic transmissions. The family has three main members: the 6HK1, a 7.8 litre turbocharged and intercooled engine with a single overhead camshaft, 24 valves and high-pressure common-rail direct injection; the 6HH1, an 8.2 litre naturally aspirated engine with mechanical inline injection; and the 6HE1, a 7.1 litre engine offered naturally aspirated or turbocharged. Quoted outputs range from about 165 to 300 horsepower across the variants, with torque in the range of 330 to 860 pound-feet.