CBM Custom water neck fitting for most LS1, LS2, LS3 LS6, and LS7 style engines. This water neck is machined here in the USA from a solid piece of 6061-T6 aircraft grade billet aluminum. It presses in place of the factory steel push in piece accepts a -20AN fitting. Simply pull out the factory 1.5" barbed fitting and press or weld this unit in place. This auction is for 1 top press in fitting in a -20AN short style (bottom bolt on fitting is available separately). The press in fitting is available in a long version as well as -20AN and -12AN sizes. This fitting has a 1.299" base. It will only fit Genuine GM pumps and may be too loose for aftermarket pumps. For aftermarket pumps, we recommend running our CBM-10621 top fitting with a 1.310" base. It will also work with many of the 4.8L, 5.3L, or 6.0L truck water pumps.
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