Mopar timing chain tensioner

Captainkirk said

To keep your cam timing "on" while decellerating (engine braking). Sometimes hi-lift cams can cause the valves and piston to miss by a whisker....that backlash can eat up that whisker. There may be other reasons, too that I'm not aware of.

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I'll be honest with you. I would never run an engine that has the valves running so close to a piston collision that I would need a tensioner. I've built a few Big and small blocks over the years (mostly big) using anything from .500" to .600" lift cams and always balanced the clearance needs of the valves with the deck height and the type of piston used such as a flat top or notched. If I built an engine where a collision was a concern I would go with a gear drive cam set. My opinion for what it's worth :evil2: