Most engine builders install a timing set the same way: line up the marked tooth on the crank gear with the marked tooth on the cam gear, bolt it together, and move on. That approach installs the camshaft at the exact centerline the manufacturer ground into it, which is a perfectly reasonable default. It is also leaving performance on the table.
Every camshaft has an intended installed centerline, but that number is a starting recommendation, not a law. The actual ideal centerline for your specific engine depends on compression ratio, vehicle weight, transmission and converter combination, and where you want the power band to live. A standard fixed timing gear cannot adjust for any of that.
Moving the cam timing earlier, or advancing it, closes the intake valve sooner relative to crank position. This generally builds cylinder pressure earlier in the cycle, increasing low-end torque and throttle response. Heavier vehicles, vehicles with a tall rear gear, or combinations paired with a lower stall converter often respond well to a few degrees of advance.
Moving the cam timing later, or retarding it, delays intake valve closing, which tends to move the power band higher in the RPM range and can improve top-end breathing at the expense of some low-end torque. Drag combinations built around a higher stall converter or a car geared to spend more time at higher RPM often benefit from a few degrees of retard.
A slotted cam gear uses an elongated bolt hole pattern instead of fixed holes, allowing the gear to be rotated in small increments relative to the cam and locked down at the desired position. This offers fine, continuously variable adjustment, which is useful when you are degreeing the cam in and want to land on a precise centerline rather than the nearest fixed step.
A multi-keyway crank gear includes several keyway slots at fixed offsets, typically in increments such as 4 degrees, allowing the installer to select a specific, repeatable advance or retard setting simply by choosing which keyway the key sits in. This method is fast, reliable, and removes any chance of the gear position shifting after installation.
Two engines with identical camshafts, identical heads, and identical compression can want different cam timing simply because one is bolted into a heavy truck and the other into a lightweight drag car. Dialing in cam timing lets you shift where peak torque and peak horsepower occur on the RPM curve, tuning the engine’s character to match the vehicle and transmission rather than accepting a one-size-fits-all setting.
With more than 96 timing set options in our store, covering both slotted and multi-keyway designs across small block, big block, LS, and LT applications, there is a configuration built for nearly every combination on the market. Degreeing in a camshaft takes an extra hour on install day. The torque curve you gain by getting it right is worth every minute.
