Timing chain advice, split roller or solid

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Pro Gear is a quality product as is JP. Pro Gear pictured below. The slack that occurs can often occur by the gears wearing in the valley between the peaks thus shortening the distance between the gears. You want both gears to be hardened so that wear is reduced. Some chain kits do not have hardened gears and in some other kits only one gear is.

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I ordered the Pro gear from Hughes. Thanks for the tip
 
I remember a quote from a noted engine builder… “all you need is a single timing chain but double rollers make more money”…
 
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