Putting a rebuilt but stock 61-261 into a 37 chassis. The original 216 was non pressurized and I believe the 261 was pressurized to 5-7#??. Am using predaves adapter plate w/ older rebuilt water pump and original 216 fan. Anyone with words of wisdom for me? If I go nonpressure, I don't have to change the radiator neck and eliminate pressure stress on radiator and heater core but I wonder about boilover and engine performance?? All info is appreciated
