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A general motors engine made from 1987 until 2002, which came in several different varietes and underwent several redesigns until it was replaced with the ecotec in 2003.  It is a dual overhead cam, 16 valve, inline 4 cylinder gasoline engine.  Various versions produced made from 150 up to 190 horsepower, depending on year model and vin number.  Displacements ranged from 2.3L to 2.4L.  A single-overhead-cam, 8 valve version was also produced as an economy version.  It had the same displacement but only produced 110-115 horsepower.  The Quad 4 was once hailed as the powerplant of the future, having the power of a V-8 while the effeciancy of a 4 cylinder.  It turned out to be a problematic engine.  Before GM worked out the issues with head-gaskets, the ignition system, and other misc. problems the engine had already earned a bad reputation. This is especially because of the single-overhead-cam version, which used a horrible amalgamation of parts and was the worst version of this engine ever made.  The shining redeption of the Quad 4 was its potential as a FWD performance powerplant.  It helped Oldsmobile win many SCCA SOLO2 and ISMA competitions, and set a land speed record in the early 90's with the Oldsmobile Areotech.  Many hot rodders and tuners thus choose to use the quad 4 because of its potential.

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