proflow water neck, thermostat housing, spacer, suit sb & bb chevrolet, 2x 3/8'' npt ports, billet, black

Our water neck spacer for the SB & BB Chev engine adds 2x 3/8" NPT auxillary ports which can be used to add coolant lines or sensors, including a water feed for your turbocahrger or supplying extra coolant to the rear of the cylinder heads. 

• Includes high-temp Viton o-ring 


• Height = 27mm