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When you think of belt drives that replace timing chains, chances are, you're thinking of a Jesel belt drive system. Jesel invented the belt drive setup. Yes, they're extremely good at developing string belt systems. Jesel also improved the system as the years went by. You can adjust the cam timing externally with some of their new systems. While Jesel is known for belt drive systems, they also make some hardcore racing parts. Their valvetrain components are used by top racers because they don't break. Jesel shaft rocker systems and roller lifters are virtually bulletproof.