WS.6#384

iTrader: (6)

I remember hearing that it was better to jumper the back coolant ports instead of blocking off. I was planning on cutting my old line and using this black tubing so it would be out of the way of intake. Is this correct?

99FormulaM6

iTrader: (21)

you can grind down the fins on the bottom of the LS6 intake and keep the ls1 crossover pipes

rel3rd

iTrader: (43)

Yep...just did mine today and that's the route I took.

WS.6#384

iTrader: (6)

The company that put my 02 motor in my 98 car used block offs on the back. I am asking about plumbing across the back, seems I remember this being a better way. I appreciate your responses on grinding down intake, but. If I were going to use back, Is it correct to just jumper across?

TAwhore

could you use the ls1 lines with a 90/90 set up?

BLWN1

iTrader: (6)

Can you not block them all off, or do they serve more than 1 purpose?

WS.6#384

iTrader: (6)

Seems I had heard something about it was better to have a bypass in the back as well to cool.

Jeff@TotalPerformanceEng

iTrader: (6)

If that was the case, then why is it that every setup from 2001 and up is blocked off in the rear. They serve ZERO usefull purpose.
Block'em off and be done with it.

BLWN1

iTrader: (6)

Areyou saying just the rear, or block them all of? Wont be a daily driver, so not too worried about them, if its minor issues?

99FormulaM6

iTrader: (21)

i wouldnt say they serve ZERO useful purpose. They keep coolant flowing b/t the heads. Alot of people have had problems with cyl #7 and some attribute it to having those holes blocked off.

you can block them off totally i suppose, but i wouldnt. the crossover pipe just flows coolant between the heads. but if its just a track car...i dont think it would matter. hell, some people fill the block completely....granted they can only make it down the track a few times before overheating... if its not a street car, what does it matter?

427

iTrader: (3)

Connecting the heads together won't really do much, if its a stocker the block off should be fine. If it is a race engine, I would connect the rear to the front like an old LS1, or run a line from the rear ports to the top of the radiator or a collection can if you are using one.

Kurt

99FormulaM6

iTrader: (21)

Kurt,

You're saying instead of having the line go from head to head, have it go from the front to back of each head? What is the benefit of that?

427

iTrader: (3)

I believe it needs a line connecting it to the radiator or collection can. The idea is to clear air from all four corners. When a LS "pushes water", it is actually pushing combustion air into the cooling system, and that displaces water from the radiator. If you don't have the coolant lines to clear the air, it will be trapped high in the head, insulating the backside of the combustion chamber from the cooling water. This can cause problems.

Kurt

99FormulaM6

iTrader: (21)

Oh, ok. That makes sense

WS.6#384

iTrader: (6)

I have found several references to #7 problems associated with coolant flow block-offs. Some say it is more to do with design of the intake. I wish that I would have known about all of this before, I would have bought a 98 coolant line to be safe and grinded the tabs. The company that installed my 02 motor used new style in front and blocked rear but put the reg LS1 intake back on. I was just trying to get the rear plumbed correctly in case there was any truth to the #7 coolant story. So I may just plug the rear, still thinking about it. Can you draw a sketch of how to plumb rear into front using what I have? (two front pieces). I do not have the single I type piece. Am I making it a big deal for nothing? I have been searching post for 2 days, seems nobody ever came up with a for sure answer and most of the how to articles are invalid links. Just want to be sure before I plug them.

99FormulaM6

iTrader: (21)

Do you mean to set it up like in the pre-01 setups? You could just buy the stock piece off someone who is putting on a LS6 intake and are blocking the rear ports.

but if you have two of the same pieces that are in the photo you posted, just use the front one normal and cut the T portion off the other one and use hose to reconnect it.. Easiest way would be to buy one from someone though

SSDoubleK

iTrader: (100)

Well the 01's and 02's come strock like that with the rear plugs, I ran the same Fast Inake on my 98 and on my presant 00SS, no problems doing the block off or heating issues.

WS.6#384

iTrader: (6)

plugged them.

1Hotbird

iTrader: (5)

I used the pre-2000 ls-1 coolant lines and clearanced the ls6 intake, when I installed my lsx 454 and it had the ls6 center cover, the PCV fitting made it impossible to use the coolant line as it was. I bent up the line with a brake line bender to make it work.

Even if there is no proven gain by connecting the rears to the front it gave me a little piece of mind. If it helps the #7 cylinder Great if not, I’m only out a little time. In my case it also saved me from having to buy the Ls6 plugs and front pipe.