Just providing information. I split the hot water coming from the heater core outlet on top of the engine and feed one half to the intake water jackets, and the other half to this pressure manifold. Hot water departs out the bottom of the pressure manifold and travels to a small heater core inside the firewall. You can see the air inlet with butterfly valve just below the overflow tank. This system works very well in the winter time.
Water exits the heater coil and then routs through copper tubing coiled in the oil tank.
This is similar to Tracy Crooks installation. From there the water returns to the main water radiator. The oil tank holds 1 gal and has two sight glasses. To date I have not burned or consumed any oil. You can see the exhaust pipe here.