oldsmobile ld2

The Quad 4 is a family of straight-four engines produced by General Motors' Oldsmobile division. Several double overhead camshaft versions were produced between 1987 and 2002, and one single overhead camshaft model was built from 1992 to 1994.
The Quad 4 is the first domestic regular production DOHC four-cylinder engine wholly designed and built by GM, the only similar prior example being the Chevrolet Cosworth Vega, whose DOHC head was designed by Cosworth in England. In addition to the 2. 3-liter DOHC Quad 4s, there was also a short-lived 2. 3-liter SOHC variant called the "Quad OHC", available from 1992 to 1994, and the 2. 4-liter Twin Cam, available from 1996 to 2002....