Updating GM’s Quad 4 Engine - Engine Builder Magazine
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Updating GM’s Quad 4 Engine

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The Olds Quad 4 was the first production, four-valve, DOHC four cylinder engine built by General Motors. When it was introduced in 1987, it was heralded as a revolutionary new design that was expected to be as historically significant as the original Olds Rocket V8 was in 1949.

The Quad 4 had four valves per cylinder, tuned intake and exhaust manifolds, no distributor, no plug wires, lightweight rods and pistons to reduce shaking forces, and a crank with eight counterweights that was designed to reduce noise, vibration and harshness (NVH) and bearing wear. It didn

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