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Return to Parts List Category : D- Big Block (Low Deck) : Timing Chain & Component : Timing Chain Sets : 1 Bolt HUG 6427 TIMING CHAIN SET, 1 BOLT CAM, 3 KEY PROGEAR BRAND TRUE DOUBLE ROLLER W/ HARDENED GEARS. 4º INCREMENTS $129.30   Progear Brand True Double Roller W/ Hardened Gears. 4º Increments   We are surprised at how many brands are out there selling so called "high performance timing sets" with crankshaft sprockets that not even hardened. Some are just virgin steel and some have the appearance of being heat treated, but are not actually hardened. Some are powdered metal. Progear crankshaft sprockets are made from 1141 steel and are all hardened to 50 Rc. But we wanted to be better. On the 3000 and 4000 series not only is the crank sprocket hardened, the camshaft sprocket is heat treated as well. We also saw that the other sprockets being sold were full of razor sharp edges. Viewed through a jeweler's loupe these sprockets are full of hanging burrs, many of which will end up in the oil pump. All Progear sprockets are vibratory tumbled. All steel sprockets are hand filed and then vibratory tumbled twice--once before heat treat and again after heat treat. This knocks off any hanging burrs, eliminates sharp edges and removes heat treat scale. It also peens and work hardens the surfaces for more durability. No other manufacturers that we know of take the time to vibratory finish the sprockets. Only Progear. These timing sets are identical to our premium 4000 series only they have three keyways as opposed to the nine keyways in our 4000 series. Each set features:    American Made Specially heat treated camshaft sprockets Heat treated STEEL crankshaft sprockets Black oxide coated crankshaft sprockets 3 keyway crank gear (0, +/- 4° at the camshaft) Timing marks, numbers and letters are highlighted in white for easier alignment Super-duty, independent, double roller chains with seamless, extruded rollers Sets are available in under sizes for line bored/honed blocks. Please specify the undersize when ordering                                     Related Parts:  HUG 7007    Cam Bolt & Washer