Hey thanks Dave for all that interesting info....and today I swapped that waterpump for the one you described with the three quarters NPT thread in the top.Im putting this 292 in a 78 K-10 chevy 4x4.I believe it uses a blend door rather than a heater control valve because I put an inline shut off valve trying to make it cooler in the cab in the summer.Any way if I'm wrong can i put a heater hose outlet in the top and run a hose from it to one of my outlets on my thermostat housing because I have two plugged holes there or can I just plug the upper hole period?..........Thanks for your time...........Gerald a Honda tech
