Drag Cartel K-series Lower Timing Chain Guide - K20, K24 (except K24Z) - DC-LWR-GUDDRAG CARTEL Lower Timing Chain Guide Provides Two Functions: Upgrades the OEM lower chain guide. Prevents timing chain slippage off the crank pulley chain gear when performing a cam swap. If you're a K Series head, you know about the keeping the timing chain held up when performing a cam swap and how much of a pain it is when it does slip! Features: Fits both K20 and K24 engines Prevents timing chain from skipping teeth Secures chain in case of timing