446 Tools, cylinder hold-down nut set

When you are performing top-end service or engine tuning, keeping the cylinders secure while the heads are off is critical. This set of four Lang Tools cylinder hold-down nuts allows you to turn the engine over safely during maintenance without the risk of moving the cylinders or damaging the base gaskets. These specialty nuts are designed to fit all Harley-Davidson models equipped with 3/8-16 UNC threaded studs. This includes late 1985–2017 Big Twin models (excluding Milwaukee-Eight engines), 1986–2022 Sportsters, and 2008–2012 XR1200 models. Sold as a set of four, they are a must-have for any mechanic who regularly works on Evolution or Twin Cam top ends and wants to ensure professional results during the assembly and timing process.