coolant crossover pipes
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.
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.
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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?
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
9 Second Club
Joined: Dec 2007
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From: Eagle River, Alaska
you prob. got confused because their both H-shaped(ls1 crossover)
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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?
9 Second Club
Joined: Dec 2007
Posts: 342
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From: Eagle River, Alaska
You want to have all 4 points vented. Do not block any of them off.
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Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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.
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.
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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?
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
also, running a FAST 75mm
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
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?
Thread Starter
Joined: Mar 2011
Posts: 3,699
Likes: 168
From: Wilmington, DE
Wait the gm crosover blocks off the front two right? y did u choose to bock the rears off