Paul Bell

iTrader: (9)

The original design of these engines had two coolant tubes per head. If GM could do without them they would not have used them.

I also trimmed off the ribs on my LS6 intake manifold when I installed it. I didn’t touch the coolant bleed lines-they’re all still there. The manifold fits just fine.

I would think that any work on these engines should not disturb or remove these lines. Any little bit of cooling and the purging of steam from both corners of the heads should be welcomed and retained.

As I don’t have a F.A.S.T intake, it would make sense to me that if it’s floor is thin, the heat from these tubes might affect it. However, I think it’s a stretch to think that these tubes will heat the incoming aircharge.

Floorman279

iTrader: (11)

so wait if i were to swap to an ls6 or fast, than if i modify the bottum of the inake and take car of those clips like you said, than i do NOT need the coolant crossover?

jc98ss

iTrader: (13)

you will definitely need a rear coolant crossover for a FAST intake, it won't clear, but for LS6 just bend the the stock coolant lines down and remove the knock sensor wire clips

Frozen WS6

That's your fuel lines, it's metal piping that goes to your injectors.

southsidecox

iTrader: (11)

uhh, no dude, i beleive your referring to the fuel rail,coolant crossover is underneath ls1 intakes,and ls6 is two seperate systems front and back of the intake(unless someone has modified them)

you prob. got confused because their both H-shaped(ls1 crossover)

Floorman279

iTrader: (11)

Yea the whole h shaped confused me. So with the crossover tube, u r essentailly blocking the front two holes off right? Then just using the rears? Where does that rubber hose conne ct to on the gm crossover tube?

trans_am7935

iTrader: (15)

oh you crack me up...i believe you are talking about the fuel line

Frozen WS6

You want to have all 4 points vented. Do not block any of them off.

Shockwave179

iTrader: (7)

So what is the part number for the LS6 rear crossover tube?

Floorman279

iTrader: (11)

http://cgi.ebay.com/ebaymotors/Corve...#ht_1423wt_749

check it out, not sure what the gm number is

see if i am going to a fast intake i do not have a choice of modifying. I have to get rid of the coolant lines underneath the intake. This is the pipe that i "NEED". it blocks off the front two with the clips, and only uses the rear coolant holes. you guys are saying not to block off the fronts but i dont have a choice with the fast.

kevin kuether

iTrader: (1)

Fast gives you gm part numbers in the instructions for what crossover parts you need.

Floorman279

iTrader: (11)

I see how youre thinking that if they were not needed than gm wouldnt have had the front vent holes. But the coolant crossover that is made to run the other intakes is a "GM" part and with the part it blocks the two off. if it wasnt ok to do so, GM would have ever made the part. IT would be some knock off. So by going with that theory, it should be more than 100% ok to block the front two off

99'CajunFirehawk157

iTrader: (57)

Thats a heck of a theory on someone else's engine!

Floorman279

iTrader: (11)

all i meant by that is GM wouldnt make a part unless its without a doubt ok to go on a vehicle

99'CajunFirehawk157

iTrader: (57)

I understood what YOU meant, and I no gm expert here but if memory serves me GM made this kit so they could use up existing LS1 blocks before the LS6 block were introduced into the line or the first issue LS6 blocks had 4 holes and after a head design they found they only needed two? I would find some one knowledgeable about this part before I told someone to use it. I am positive GM never made this so people could use FAST intakes, they could car less about fast's parts.
What I think has happened over time is the people using FAST intakes are using these parts and its working, is that to say it may also cause someones engine to overheat and crack a head or block, maybe? who can say for certain. GM maybe? Maybe the OP needs to post a question specifically in regards to fast intakes and cooling lines in a separate thread?

thegroup

iTrader: (1)

ive ran the rear block-offs for the last 3 years with no problems. my pistons looked good with no hot spots or anything of the sort and i put maybe 50 drag races on it last years. just my input

also, running a FAST 75mm

Floorman279

iTrader: (11)

i no that they didnt make them for the fast intake lol. But since they used this part on BRAND NEW blocks like you said, if they had any doubts about it they wouldnt have used it. it may increase the chance of what you said, but even if it was remotely close to hurting anything, gm would have to repair anything that went wrong like overheating becasue it would be under a warranty, since it was used on a brand new vehicle. Am i wrong for thinking this?

Paul Bell

iTrader: (9)

What do these things have to do with the block? They attach to the heads.

Floorman279

iTrader: (11)

Wait the gm crosover blocks off the front two right? y did u choose to bock the rears off

thegroup

iTrader: (1)

That's where I meant. The 2 block-offs the back and the ls6 tube on the front