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They did a test about a year ago
Caprimanic They tested a gear drive, timing chain, and belt drive. The belt drive only did well in the adjustment department, it's was quieter then the Gear drive and removed more harmonics then the timing chain. Gears where more accurate, timing chain easier to install and made the more midrange power. It's a choice thing. Mine 498 is track motor only and I am not running big valve spring pressures. I am looking in another direction for valve train design. Lighter is better. Rick L.
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