Hot Rod

Advance or Retard: Olds Quad 4 Engine Ignition Timing with ZEX Nitrous Kit

Duvernay has the highest stock output production Quad 4: the 190-hp 1991 to 1992 RPO W41. The 1993 W41 lost 10 hp due to smaller exhaust ports. Photo: Kevin Davis via Wikipedia (CC-3.0) A 1992 ...