here is an excerpt from instructions to shop concerning coolant system.
(I converted reservoir tank to pressure tank with continous venting)
Factory Mod (TSB A-19) added an upper radiator outlet tank vent (hose 37) down to the return tube (18). To enhance the venting capability, I would like to install a thin sleeve in the return tube, just up stream of the vent hose connection to create a slight venture suction.
A second factory mod (TSB A-61) recomended was to vent the radiator’s end tank back to the engine bay. This design was flawed as it connected to the swirl tank (higher pressure than radiator). I didn’t have this mod, so the tube 37c was not under the car.
The shown desired has radiator left end tank’s vent going to the pressure tank (water pump suction pressure). An ~3/8 SS tube will need to be fitted under the car with barbed ends for hose connections
here is illustration showing original configuration upper with lower showing converstion to continous venting. PLUS, moving pressure setting cap from pump discharge to suction (midigates flashing/cavitation)
