The Cloyes® Patented 3-Keyway crank sprocket allows adjustment of the crankshaft timing by ±4°.
Remember: The camshaft angle is half of the crankshaft angle, therefore the camshaft will correspondingly advance or retard by ±2°.
By changing the cam timing, enhancements to the camshaft characteristics can be achieved. For example, retarding the cam timing will increase high RPM horsepower, and advancing the cam timing will increase low-end torque.
Retarding your timing will increase horsepower at high RPM. This would be for all out racing applications. Advancing your timing will give you maximum power at low RPM. This would be advantageous for drag racing applications or heavy towing needs.
The timing drive system in your engine is just that, a system, with inter-related components. For "peace of mind", to reduce the chances of having to re-do the job, and for optimum performance, it is strongly recommended that all components are replaced together.
Center Distance is the measurement taken from the center of the camshaft to the center of the crankshaft.
Though all engine blocks will vary slightly, your everyday vehicles will already have standard center distance. However, if your block has been machined or aligned honed, then your camshaft and crankshaft are going to be closer together. For everyday street applications you can get away with just using a shim kit to take up the slack. However, in a race application, you should order a Cloyes reduced center distance performance set.
If your engine gets out of proper timing, the valves and pistons will "interfere" (collide) with one another, which could result in significant engine damage. That is why it is important to replace worn timing components before a failure occurs.
Cloyes does offer reduced center distance sets, available in .005 & .010 reduced, for most of our premium (Original True, Billet True, Hex-A-Just, Quick Adjust) performance sets to accommodate your align honed engines. Each of these sets are "hand matched" at the Cloyes factory to ensure true and accurate center distance.
Customer feedback has led us to make a change to the cam sprocket. The bolt hole area is now flush (as opposed to recessed) allowing you to use you choice of bolts. Due to this change, we no longer supply the special hex bolts.
All Ford 460 blocks manufactured between 1973 and 1987 were 8 degrees retarded in order to meet emmission requirements.