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. I have a 1992 Olds Achieva SCX with a W41 Quad 4 engine ...
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Mastering engine timing for a healthier ride
Engine timing isn’t just a mechanic’s obsession—it’s the heartbeat of your car’s performance and longevity. From smoother starts to preventing catastrophic damage, knowing when and how to check timing ...
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