Top Dead Center Stop Tool- 18mm Bolt Style

The COMP CAMS Top Dead Center Stop Tool – 18mm Bolt Style is an essential precision instrument for engine builders, performance mechanics, and serious enthusiasts who demand accuracy during crankshaft positioning and timing setup. This hardened steel tool eliminates guesswork when locking the crankshaft at top dead center (TDC), a critical step in camshaft installation, valve timing verification, and ignition timing adjustments. Whether you're dialing in a Big Block Ford or any engine requiring repeatable TDC reference points, this tool prevents costly mistakes that could result in bent valves, broken pushrods, or compromised ignition curves.

Engineered from cadmium-plated steel for corrosion resistance and durability, the 18mm bolt-style design threads directly into the cylinder head, creating a positive mechanical stop that halts crankshaft rotation at precisely TDC without relying on dial indicators or estimation. The compact 4.1-inch length and 1.55 x 1-inch profile allow access in tight engine bays while maintaining the rigidity needed to withstand the rotational forces during installation. The cadmium plating protects against rust and extends tool life through multiple rebuild cycles, ensuring consistent performance across seasons and storage conditions.

This tool is indispensable for Big Block Ford applications and compatible with any engine featuring an 18mm bolt hole in the cylinder head at the TDC location. Professional engine builders rely on it during cam swaps, timing chain replacements, and detailed assembly verification to lock the crankshaft safely before installing rocker arms, pushrods, or degree wheels. Lightweight at just 0.16 lbs, it's a must-have for any serious mechanic's toolkit—affordable insurance against expensive mistakes during high-stakes engine work.