Didn't want to let this thread die. I'd love to do this mod to clean up the engine bay a bit but was wondering if it would be beneficial to use one of these: https://www.meziere.com/Products/Co...ds/Four-to-One-Manifold-1-5-hose-to-12AN.aspx to combine the coolant into the radiator. I was thinking there would be 2 lines from the front of the heads, one line from the driver's side rear and the heater return hose which is fed by the passenger side rear head. Is the radiator inlet/outlet 1.5 or 1.75"? I'm pretty sure the radiator outlet is 1.75"