Billet LS Straight Thermostat Water Neck -20AN -20 AN FittingProduct images may differ from actual product appearance.
Billet LS Straight Thermostat Water Neck -20AN -20 AN Fitting
Custom water neck fitting for LS1, LS2, LS6, and LS7 style engines. This CBM water neck is machined from a solid piece of 6061-T6 aircraft grade billet aluminum right here in the USA. It bolts in place of the factory angled unit and accepts a -20AN fitting. This unit accepts the original GM thermostat from a LS1, LS2, pre-2008 LS7. 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.