Aeroflow's Chevy thermostat housing spacer kit is the perfect solution for allowing an extra auxiliary port of coolant and can be used for many applications including plumbing coolant to a turbocharger , extra coolant flow from rear of heads or simply connecting your heater in a conversion. The unit is 28mm (1-7/64") high and features 2x -8 ORB female threads.
-8 ORB port plugs are available here
Available in Silver or Black.