OK guys, need some help here.

6 months ago I blew a headgasket... I found the limits of the stock HG with ARP 2000 studs torqued to 125. It is around 870hp.

So I replace the ARP 2000's with ARP 625's torqued to 150... HG blew early this time...

Head off to machine shop, sure enough it needs a little shaving, head pressure tested now... it is all good. Block deck is checked and is primo...

new HG installed...studs torqued to 155... And of course I am babying the truck on stock programming until I can do my last retorque. However... it is eating water somewhere. I have checked all external hoses, no visible leaks anywhere. But I lose about one gallon of water in 65 miles.

What gives??? The only symptom of note that I can find is the tranny is a lot cooler running (down to 140* from a more normal 170-180*) THis could be from the heat exchanger not getting water through it... but I checked that and it is good...

Any ideas are appreciated!

 

make sure your noy getting boost in the cooling system,you need to put a load on it in a dyno.

 

Is the water pump pully wabeling at all when truck is running? Mine was doing the same then then started to over heat. Water pump was out. If it is wabeling it is done.

 

No waterpump wobble... a newer unit, only 10k miles on it.

 

Where is it missing from? The radiator or overflow tank. You have an Opie bypass, correct????

 

I would think a gallon in 65 miles you should see it dripping from the exhaust,how about pressurizing the radiator and look for bleed off?

Any white smoke while running?

 

It will miss from both as the reservoir empties, and yes on the bypass.

 

I have not pressurized yet. Have to get to the shop to do that. It does not drip from the exhaust and there is no gray smoke. Just my normal haze... No smell of antifreeze in the exhaust or anywhere else either.

 

It seems strange that you can't find where it is going with it disappearing at that rate. That's a lot of coolant gone in a short period of time. I think if it were mine I would do as Mr Jerry suggested and pressurize the coolant system.

 

I see I was late again!

 

Pressurizing the system will help isolate it. No milky oil I would assume, just checking. I would do one thing with the bypass, I ran into something similar. I would take the radiator cap off and leave it off, fill it full of coolant, crank the truck up and bleed the back side of the Opie bypass to ensure you have all of the air out of the system. Run the truck until the thermostate opens and fill the radiator full. See how she does then. Air pockets can be a pain!!!!!!!


Oh, if you have an air pocket you will know it. when you crack the back line of the opie bypass air will come out with a touch of fluid at first.

 

LOLOL!!!!!! A day late and a $ Short,,,,,,,, again!!!!!!

Good thinking!!!!!! it will be worth a try,,,,

 

Yeah, I had problems when I put the bypass on. Ticked me off, I knew I had an air pocket, took me a bit to figure it out and how to clear it. I got so mad I just started over from scratch.

 

You know I figured on the air pockets, that is common and usually work themselves out in short order... but I have now added water to the tune of four times the coolant system capacity.... that is not an air pocket.

No water in the oil (no oil or tranny fluid in the water either); no water in tranny fluid; no water visibly leaking on the ground; no visible leaks from any of the many external lines, (checked with engine running and coolant at full temp-- gotta be pressurized to an extent)

 

Some air pockets don't work themselves out. You have to make them come out, cussing and fussing the whole way....LOL Give it a shot, won't hurt.