So, to be clear on this concept, which way will the coolant be flowing in that tube ?
From the rear to the thermostat housing? Yes. Out of the head, forward through the tube and into the bottom part of the thermostat housing. It will also help clear the "air bubble" that persists at the rear of the head when coolant is changed.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| 
