Which aftermarket component is placed in the cam gear dowel hole to alter the cam timing?

• A. Adjustable Cam Gear
• B. Offset Cam Bushings
• C. Multi-keyway Crankshaft Gear
• D. Timing Chain

Answer: (B)

Timing of the valves is set by how the camshaft rotates in relation to the crankshaft. One precise way to nudge that relationship is to use an offset component that fits into the cam gear's dowel hole. Installing an offset cam bushing in that hole shifts the cam gear a small amount on the camshaft, which changes when the cam gear lines up with the crank gear each revolution. That shift advances or retards the valve timing without swapping gears or altering the chain.

The other options don’t fit this specific mechanism: an adjustable cam gear changes timing by altering the gear itself but not through the dowel hole; a multi-keyway crankshaft gear alters crank timing rather than cam timing via the cam gear hole; and a timing chain is the linkage, not an insert used to tweak timing in this way.