This question arose from another thread I started that stirred up some controversy, http://www.jalopyjournal.com/forum/showthread.php?t=613296 Is a byp*** hose needed from water pump to intake? No heater, can I plug all the coolant outlets in intake and water pump?
Yes Plug away.I have two cars without heat or a byp*** and they work fine.I have had several other cars the same way and they all worked fine.I am sure there will be a few know it alls that will say you can't but don't believe them.
Yes, I believe the only exception to that is later engines originally installed with vortec (L31) heads as those blocks did not have the internal byp***....I think.
There's a byp*** built into the pump. Can't recall which side of the pump and I'm not @ shop to look @ a pump, but there's an extra hole below the main intput hole on the head. One side of the pump has a corresponding hole and this lets water within the block circulate when thermostat is closed. Only time I know of needing a byp*** hose is when you use a Zip's water pump riser as they have no byp*** provision. As stated previously, I never ran a byp*** hose on a race car with no heater! Dave
There wasn't any controversy, I said you needed one and some other fellas who don't think so said you don't. I have had them overheat without one put one on and it quit overheating. No logical reason why, I don't really care why, if it works it works. If I am running sans a heater I just put a jumper hose on and then I don't worry about it, my stuff doesn't overheat.
One thing I did find out if you don't have the byp*** hose or a heater you need an air bleed hole in the thermo stat.
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