Billet LS Straight Thermostat Water Neck Fitting 1.5" Water Neck FittingProduct images may differ from actual product appearance.
Billet LS Straight Thermostat Water Neck Fitting 1.5" Water Neck Fitting
CBM's custom water neck fitting for LS1, LS2, LS6, and LS7 style engines. This water neck is machined from a solid piece of 6061-T6 aircraft grade billet aluminum right here in the USA. This new version is 3D profiled and flows 20% better then CBM's old unit. It bolts in place of the factory angled unit and accepts factory size hose (1.5"). This unit accepts the original GM thermostat from a LS1, LS2, pre-2008. It will also work with many of the 4.8L, 5.3L, or 6.0L truck water pumps. This neck will not fit 2008+ LS3, LS7, LS9, LSA, L76, or L92 water pumps.