I have had this in my mind for a long time. On some stock after market sbc intakes, the two back intake water ports are drilled and tapped, they lead to back of head . I would like to plumb this for water circulation, to the thermostat, thus lowering some water temp back there. I find these at Jegs and Edlebrock. Anyone using them? They are for the back of the heads aren't they?

http://www.jegs.com/webapp/wcs/stores/servlet/product2_10001_10002_750809_-1

Hi Don , that is what i used on my motor , those back ports where allready threaded on my holley manifold . They say it evens up the temp from front to back .
Mark .

Thanks Mark, did you use a kit like this or make your own? I was gonna plumb in the front taps to the rear but don't know if that will flow right as I think the pressure is equal, but it the rear is going to the stat, where the flow is and psi is lower, I can see it works. Just wondering if those hoses are long enuff... Kit does not state.

Don i bought the adapter from them and made my own hoses , i had to go around a couple of things on the fuel injection . They do say it equals up the temp front to back in the motor , i will try anything once .
Mark.

Good enuff for me. Thanks.

So.. You just drill and tap your intake through the rear blocked water ports and plumb the hoses up to the thermostat housing?... Will this work for my BB car?... Exactly how does the water flow/circulate through a BBC anyway?.. My brand new engine is running a bit hot... Thanks for any help or advice...

i've got a better idea- tie the two rear ports together, then run them thru the heater core and back to the water pump. this way, you are assured that the water will actually flow, but it won't bypass the thermostat.
Chev started running the heater off the back of the manifold in the late 80's or early 90's.