asudecat

iTrader: (11)

Anyone not running these vent lines from the back of the heads to the top of the radiator? I know there are people running like this I would just like to know who. I was assured by LME that there would be no problms(which is who built my motor). They are Dart heads by the way.
Just dont wanna have any overheating problems.
Jason

Sixspeed042

well, they are not vent lines. More actual coolant lines. I's consider those to be kind of a big deal since they are one of the main paths for coolant flow in the heads. no expert, but i wouldn't get rid of mine

asudecat

iTrader: (11)

I believe they do vent

SStrokerAce

iTrader: (2)

Well, that is the best way to bleed air out of the coolant passages, so that's why you leave it on.

Bret

asudecat

iTrader: (11)

But you dont HAVE to have them, right bret?
will I be ok?

juicedimpss

i have one engine running without them. it is fine,doesnt get hot. those lines are there to run coolant to the tb for preheating,and if that is bypassed,as most of us have already done,it really serves no purpose that i can find.

buffman

iTrader: (9)

that's not the function of those lines. Those lines are to vent steam out of the heads so you dont create hotspots in the cylinder head. I dont see why some peope feel the need to remove them. They're there for a reason, and they're not hurting anything.

-PEPE-

iTrader: (10)

Guess I'll leave mine just the way they are then, I knew they were not main coolant lines as it's been stated in this post, but was unsure how important from a steam venting perspective they really were. Sometimes it's just best to leave stuff well enough alone I reckon.

Audecat funny how you hear such different things about this stuff huh?

streetwarrior96

Well they were put there for a reason. Here is an exapmple.

god gave you a nut sac, you really don't need it (you can live with out it) would you voluntarily cut them off? LOL

the_merv

iTrader: (88)

Those lines are there to bleed out the Coolant when it turns to steam inside the Heads. One of the major differences of the LT1 from most engines is the Reverse-cooling design (first Head, then to Block flow). I have seen one blow up cause those lines were plugged. I re-designed how mine was, and I got it to work better, but don't remove them. The reason it went through the Throttle Body was that it just happen to be there.

juicedimpss

so on a retro fit install where the hell do you run the line to?
seems to me(without having a cyl head in front of me) the hole was not at the top of the coolant pocket,technically it will not bleed air.

the_merv

iTrader: (88)

It's center on the back of the Heads. When the Coolant turns into steam, it builds pressure, and goes out this line. It's designed to flow out this hole, not necessarily let air come to the top of the Coolant and then bleed out. Anything under pressure will go the path of least resistance. The flow is appx. 15-20 psi, so there is alot of steam in there that comes out.
If you have to custom fit it, it should still go in. I re-designed mine, and it take up a whole 3/4 inch extra off the back of the Head.

paul67

Its a steam line so the heads do not get hot stops as these engines run hotter than the earlier ghevy 1s do NOT remove.

paul67

Its a steam line so the heads do not get hot stops as these engines run hotter than the earlier chevy 1s do NOT remove.

T/A KID

iTrader: (12)

yea man you need it. But My advice is to run an fittings and a -6 line, I believe there could be a Performance increas with the bigger lines as well. Factory lines are very small.

asudecat

iTrader: (11)

Well I no longer have a way to hook them up because the holes are no longer on the heads, as I now have Dart heads.
Why would a respectable Engine builder like LME tell me to run it like that?
they assured me I would be ok.
Jason

the_merv

iTrader: (88)

See what happens. I have never seen any LT1/LT4 Head without them lines.

buffman

iTrader: (9)

well you can only run the steam lines if you're running Gen 2 heads. Dart doesnt make a Gen 2 from what I recall, so he may be running a converted Gen 1 on top of an LTx block?

and our engines run cooler than a gen 1. We run a colder T-stat stock, and our cylinder head temps will be lower since the coolant is cooling the heads first, then going to the block.. only thing that would be hotter would be clyinder bore temps. but they would be more uniform

the_merv

iTrader: (88)

Our Engines also run a higher Compression Ratio, and different cooling flow patterns since it is reverse cooled. If they are for a Gen I Chevy, they won't last long. If they are for a Gen II, that is the first I have heard without a Steam Line..

the_merv

iTrader: (88)

I have been talking about before, this is how I re-designed the Steam Line on mine. Been running 2 months, and no problems.