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There is a silver metal pipe next to the throttle body coming from the cylinder head. [U.S driver side]
What does it do and where do I link it to? [think its something to do with water]

Also at the back of the inlet manifold there is a pipe coming off. What does this do?

 

Steam return line(s)......


T,

 

What do I do with them?

 

Run the one to the drivers side of the Throttle Body to the top of the Radiator right below the filler neck.

 

Im retro fitting the engine into a car with the filler neck on the radiator which wont let me fit it as the take off for the over flow is present.

 

try search i think there are a couple solutions but i remeber somewere that they dapped into the return coolant line with it. it need to be hooked up for sure

 

Alot of people tap it into the Water Pump.

 

any one have any pics?

 

Here are a couple of ways....you can't use the overflow on a radiator neck....


Water Pump Tap


Upp Radiator Hose Tap Pics 13 and 14


T,

 

Take the W.P. off the engine before you drill & tap it, to allow you to get all the metal shavings out. Thread in a 90 degree fitting, instead of a straight up fitting. Seal the threads when you do. Make sure you drill the hole for the fitting, offset to the far side of that flat top area of the water-pump, to allow plenty of clearance for the movement of the throttle cam/cable assembly.

 

X2.. I saw that in the pics and was like

 

^
helpless

 

Excellent I was thinking about tapping into the top hose but was worried about the pressure.

Obviously no need to worry.

 

This has come up a few times on here and there are varying opinions. What I did is leave it open until water came out then I just capped it off. Been running it this way for 10k miles and haven't had a problem yet. Many others have done the same.

 

So instead of plumbing it in you have blocked it?

Does this have any negative affects?

Also can someone explain to me what that pipe actually does because on all the other cars Ive worked on steam pipes dont come up?

 

There has been *A LOT* of discussion about this.
Way too much information and opinions to rehash here.

I would suggest going to the advanced search feature and search the word steam in the conversions and hybrids subforum.

You will find more information than you can imagine.

 

GM designed them into the engine for a reason. They eliminate cylinder head cooling "hot-spots", among other things.

 

I like this solution done by Andrew aka.. Project GatTagO

 

That's a nice one..

 

The last thing I want to do is get into an argument about this again but basically its supposed to help get rid of steam pockets that might get stuck in the head. I would consider this to be most threatening when one is first filling with fluids(which is why I waited for the fluid to come out before I capped it). I really didn't want to be drilling and tapping every time I replace a waterpump which hopefully won't be often. At any rate, the only time it should really be a problem is if you are running a high hp car. In fact some engine builders go ahead and connect all 4 steam vent holes on high hp builds.