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20410-11, 15, 20-21, 25, 40, 42-43, 46, 50-51 & 55: Installation Instructions for 9-Keyway Timing Sets

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Installation Instructions for 20410,11,15,20,21,25,40,42,43,46,50,51 & 55

9-Keyway Timing Sets

The Billet Steel Q-Position Crank Sprockets glue the installer the ability to correct or re-position camshaft timing during engine assembly. Some camshaft manufacturers instruct the user to advance or retard camshaft timing to enhance particular performance characteristics at their camshaft. Movements done quicker and more accurately than the use at cam sprocket bushings that require extra machining. 

Using the 9-Position Crank Sprocket, the camshaft can be advanced or retarded off of Neutral or the "Straight-Up” position by positioning the crank sprocket using 2°, 4°, 6°, or 8° Advance or Retard keyways. “A” intimates Advance and “R”indicates Retard. The location at timing marks on the tooth rim; whether located on a tooth, tooth space, or somewhere in between, is strictly a function of engine application.

Timing sprockets and chain should he pre-assembled before final assembly to check for any interference tram block imperfections or interference with oil galley holes. If interference is found, remove or grind that area the black so adequate clearance is obtained. When removing lower sprockets which are "Press Fit“, proper puller tools should be used. Care should be given to the front of the block where cam thrust is controlled for excessive wear.

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Posted on
May 10, 2018
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