....On the factory bypass you have to remember it is not circulating through the radiator just the engine & returning to the water pump so it will naturally come to temp quicker than a bypass hole in the thermostat which returns to the radiator so although the end result should be the same there is a difference in the two systems
Yes, that's what I was talking about in post #23. So I'm leaning towards drilling and tapping the manifold while I have the thing off. Like Mark said, I can always just close them up again with pipe plugs if I wanted to.
I've run the hose from rear to just under the thermostat for each side, always seemed to keep the engine more temps unified and friendly, never had a problem doing it. There were other brands of engines that had cast in side to side passages at the rear of their V8 engines, no problems with those, either.
Thank you for mentioning that. I thought I had seen pics somewhere of certain engines with intake manifolds that were plumbed like that before. I just cannot remember what they were, nor where I've seen them. I wish I could see for myself exactly what directions the water pump pushes the water through the engine and manifold, and how that current is effected by a bypass hose vs. not having a bypass hose, as well as how external add-on hoses might effect the current and flow, (if at all).
For instance: does the water pump draw the water from one side of the block, and push it through the other side while the thermostat is closed? And if so, which side does it draw from? And once the thermostat opens, and the water pump is drawing the water from the lower radiator hose, does it then push the water into both sides of the block, or does is still draw from one side and push it through the other side of the block? Do any of the two small ports at the top of the GM Long pumps draw water in, or do they both push the water out? And how might all that be effected by the bypass hose in the front of the block? Can anyone say for certain without actually sticking the lower radiator hose in a bathtub full of water with the hose still clamped to the pump, and finding a way to spin the pump to see for them self??
Has anyone here ever dismantled a GM water pump and had a look at the shape of the impeller? I cannot say that I have. If I did, then maybe I would have a better understanding of exactly how these mechanical pumps navigate the water through the engine block, and through the manifold.