I'm building a fairly high HP setup and the last thing we need to address is the coolant crossover tubes. I don't want to block off the rears. Anyone have suggestions on a solution? The heads are ETP LS7 6 bolt.

 

i drilled and tapped the heads for 1/4 npt and am using 1/4npt/-4an fittings and some stainless hardlind to connect them

 

What do you do? Run it along the side of the intake?

 

I am running a single plane manifold, the lines run under the intake.

 

How does this help cooling any? Is it hurting to have these capped? Traver

 

We just put a HK Racing 408 in my Camaro and I was concerned about the rear steam vents because two of my friends recently wiped out #7 and I didn't want to take any unnecessary risks.

Anyway I used some of my old LS1 steamtubes and cut the tube so that there was about 1 1/2" sticking out from the flange that is bolted to the head. Then I used a SS tee and ran a 5/16" id line up to the front cross over and connceted it with a tee which I ran to the radiator.

It is absolutely amazing how much coolant those little hoses flow. I truly believe that these tubes also bleed off steam-air pockets that could cause hot spots. I sure have alot more peace of mind.

FWIW my last project on my 408 was installing an engine oil cooler. It was a bitch but necessary since my oil temp was getting up to 270-275. Now most of the time I stay below 200 unless I romp on it.

 

Do you have any pictures?

 

Master of understatement.

 

I used an LS6 front crossover pipe on the rear, bent the outlet at a little more angle and ran a hose along the side of the intake up to the front and joined it with the otlet of the other crossover with a brass T fitting...Working great...

 

Same here. Works great.

 

I thought about using the slugs in the link below. They have 1/8 npt female threads so you could buy AN to Pipe thread fittings and make you own hoses. I think it would look a little better than modifing the stock steam vent tube.
http://s41657.sites80.storefront-hos...l.aspx?ID=3289

 

Sweet!!!

 

I'm not sure if I am going to use SS line or SS hose but I'm probably going to use a -4 fitting in each head and run it to a T and back to the radiator.

 

FWIW all I used was fuel line hose and SS worm clamps. The hose I think was good for like 350*. I routed it on the passenger side along the top of the valve cover with the PCV line. For this application I see no reason to use -AN fittings, as that would be total over kill. Fuel hose comes in various colors if you like. I'm really glad I did this mod because I do believe coolant flow in the upper rear of the heads is a valid potential problem.

 

+1. I know what I'm going to use now.

 

This link doesnt work anymore. Does anyone have a new link?

 

I ended up using a corvette crossover pipe.

 

You definately need to have those rear ones connected to get the air bubbles and air pockets out of the back of the heads. An air pocket can overheat and crack a head.
I use the LS6 pipe on the rear with a 1/4" heater hose to a T on the front, just like the other Corvette guys above. Never had a head problem on a road race car with this set up.

 

Phil,

Check out my latest picture post. I ended up buying the adapters from Wegner automotive and connected all 4 corners of the heads to a 4 into 1 manifold from Peterson Fluids systems and then one line from there into the radiator.

Works flawlessly

 

Can you link the pic here? See lots of hoses, but none I can readily identify as the steamers.

Have contact info for Wegner's? Their site doesn't work, nor do any of the ebay store links they have.

Charlie