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.

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.

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.