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9. Shown is a comparison between the '07-up roller chain, sprocket and hydraulic tensioner (left) and the '99-'06 silent chain, cam sprocket, and spring-loaded tensioner (right). Camshafts from the two different designs are not interchangeable because the chain sprockets are different and the '07-up cams have large journal bearings on their ends. The hydraulic tensioner and roller chain are an upgrade over the silent-chain system, but gear-drive cams are the most bulletproof setup because they eliminate troublesome tensioners and improve cam timing, especially under high valve spring pressures. View Related Article
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