Hi there,

I did thought during my post last night that a thermostat put in the inlet side would work too. The water is heavier or more dense when cooler. This might be splitting hairs but at my age as I have fewer to be abused.

Maybe you can answer a few questions for me about V8's.


On my old 74 Ford 360 the water pump has a bypass hose or at least I think it's a bypass, sticking out the rear of the water pump.
I was wondering if that actually pushed water through the intake manifold and into the banks. This would heat it up sooner for emissions back then. Could it be there to circulate water through the two heads banks until the thermostat opens up that is in the intake manifold.

How does your V8 heat up as the water is going to rise up and over to the radiator by convection, if it can flow?
The water pump have a way to circulate at least some water using a bypass channel or something?
Maybe the pumps for V8's or that block has away around there being any stagnant water movement until the stat opens.
Guess I'm again splitting hairs that the engine heads are really on their way to death quicker if the thermostat fails closed. (:-(

Its been so long since I have had to change out a Volvo pump I have forgotten if there is a small hole in the block behind the pumps impeller area? If so, Maybe it's there to push water through to the heater core and back on the return pipe that goes around the engine.

I dropped wanting V8's like a deadly bad habit. That was until I had a Chevy 454 giving to me in an '87 Motorhome. The motor home reminds me of what a beast a V8 can be.
My pickup truck has been sidelined for the last 11 years. The timing chain went bye bye at 180k. The engine was very tired and not very heart warming over the years anyway.
Both are Super duper heat generators and the gas guzzlers.
I have the engine halfway out but my old V8 enthusiasm has largely waned to where we both should be in museum or scrapyard.

Thanks for the update on contemporary engines, I needed it!

Phil