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I need to replace my factory steam vent set up on my ls1 to accommodate a FAST 102 intake and matching TB..... I have found very little support for a kit that works with the 102 intakes and even the high priced ones that do supposedly work need a lot of extra fittings, the extra line that goes across the TB and modifications to work anyways. Im wondering if anybody has went out and got their own supplies individually and made a custom set up all together? and if so had a parts list that was needed for the job? TIA!
This may be a stupid question but do you put #s of the topics in the message area for more search results?
Are you trying to improved the front steam vent line or are you trying to install a 4-corner steam vent set up?
A very effective and inexpensive four corner system can be made by getting an LS1 bypass vent, 12602544, slightly modifying it to fit in the rear (bend it to clear the 102) and then routing lines together to attach to the radiator. You can include an air bleed valve in the front to rear line if you wish.
Last edited by Rich-L79; May 20, 2022 at 08:09 AM.
I used a LS6 crossover in the front and rear and tee'd them together.
I also did this just cuz I had a couple extras lying around. Those soft ones on amazon don't fit for sure I wasted money on that already. If you wanna be be fancy I think motion makes a low profile intake 4 corner kit?
I go to the junk yard and grab a front crossover from a truck. Then use a little heat and bend the outlet to be a little more vertical. I have a few spares sitting around to sell.
Then as others have said, run a line up front and use a T before going to the radiator.
Yup, thats what comes on the front of 01 & 02 cars. I wouldn't think that would be great in the rear, looks like the outlet would be going right into the firewall.
Yup, thats what comes on the front of 01 & 02 cars. I wouldn't think that would be great in the rear, looks like the outlet would be going right into the firewall.
Hopefully it does work in the rear, since I just got one for that (not tried to install yet). There should be plenty of space, either use a 90 deg elbow or replace that rubber hose with a longer flexible silicone hose (my plan) and just have it do a U bend toward the front. I'm more worried about whether it will bolt on facing "backwards".
Hopefully it does work in the rear, since I just got one for that (not tried to install yet). There should be plenty of space, either use a 90 deg elbow or replace that rubber hose with a longer flexible silicone hose (my plan) and just have it do a U bend toward the front. I'm more worried about whether it will bolt on facing "backwards".
You can always bend the outlet pipe up or to the side.
It will bolt right on on the rear, if you want to have it clear a FAST manifold or something like that you need to rebend it side to side though. The pipes are very soft and easy to bend, just bolt it down so the port connections stay in proper reference to the heads and then bend the crosspipe by hand until it clears your manifold. Pretty easy to do if you don't get heavy handed and don't try to press on the pipe in one small area so as to cause a kink.
Just adding for the archive, and since I referenced this thread several times before not listening to it, getting a Motion Raceworks V2 steam kit to go with my Fast 92 and realizing this kit is LESS than optimal in these cars (2000 Firebird Formula) especially if you're doing work while the engine is still in the car. If you drop the K member you have the room to get it together and will have no issue.
For reference the Passenger side rear steam vent tube with the motion kit is practically tucked directly under the back corner of the intake manifold and for the distribution block to be mounted on the manifold prior to sliding the manifold in(it uses the back two intake manifold bolts to mount), it not only is in direct contact with the bottom of the cowl making it off kilter until its torqued down, and you need it to move while hooking up the back steam ports. While the Drivers rear went in easy enough after finding the correct routing through the conglomerate of shenanigans behind the manifold, the passenger rear required everything to be in place as the line is very very short, and stiff making it difficult to maneuver and get set correctly and square. What happened to me, was the passenger rear port would not sit flush to the mounting surface, causing their hardware (very nice SS, but also very sharp threads) to cross-thread due to my fat hands and fingers, after that happened and I had to chase the threads I removed this kit to keep myself from doing it again.
The way I installed it was the rear two steam ports were assembled and already tied to the block and the block mounted to the bracket on the manifold. Possibly my process was the incorrect one but i just want to +1 the use of the truck crossover on the rear, or 2 ls6 crossovers and t-ing them together... save yourself the hamburger arms and money, use an easier, and probably more reliable(less connection points to leak) kit for the masses.
I'm in no way discrediting the motion kit, its an incredibly well engineered piece, I want to make that very clear. Just stating the difficulties I had installing this kit in my situation in my garage.
Just adding for the archive, and since I referenced this thread several times before not listening to it, getting a Motion Raceworks V2 steam kit to go with my Fast 92 and realizing this kit is LESS than optimal in these cars (2000 Firebird Formula) especially if you're doing work while the engine is still in the car. If you drop the K member you have the room to get it together and will have no issue.
For reference the Passenger side rear steam vent tube with the motion kit is practically tucked directly under the back corner of the intake manifold and for the distribution block to be mounted on the manifold prior to sliding the manifold in(it uses the back two intake manifold bolts to mount), it not only is in direct contact with the bottom of the cowl making it off kilter until its torqued down, and you need it to move while hooking up the back steam ports. While the Drivers rear went in easy enough after finding the correct routing through the conglomerate of shenanigans behind the manifold, the passenger rear required everything to be in place as the line is very very short, and stiff making it difficult to maneuver and get set correctly and square. What happened to me, was the passenger rear port would not sit flush to the mounting surface, causing their hardware (very nice SS, but also very sharp threads) to cross-thread due to my fat hands and fingers, after that happened and I had to chase the threads I removed this kit to keep myself from doing it again.
The way I installed it was the rear two steam ports were assembled and already tied to the block and the block mounted to the bracket on the manifold. Possibly my process was the incorrect one but i just want to +1 the use of the truck crossover on the rear, or 2 ls6 crossovers and t-ing them together... save yourself the hamburger arms and money, use an easier, and probably more reliable(less connection points to leak) kit for the masses.
I'm in no way discrediting the motion kit, its an incredibly well engineered piece, I want to make that very clear. Just stating the difficulties I had installing this kit in my situation in my garage.
AGreed 100%. Nice kit but impossible at best to install in car. I ended up flipping hoses from instructions and mounting the block up front instead of rear.
Are you trying to improved the front steam vent line or are you trying to install a 4-corner steam vent set up?
A very effective and inexpensive four corner system can be made by getting an LS1 bypass vent, 12602544, slightly modifying it to fit in the rear (bend it to clear the 102) and then routing lines together to attach to the radiator. You can include an air bleed valve in the front to rear line if you wish.
Im definitely trying to keep all four corners I don't know why anyone would not utilize them since they are there.?
I don't have a FAST intake on my 2002 TA so not sure how this would fit but years ago I added the GM 12605716 crossover tube to the rear of my LS6. It was used in a number of GM SUVs and probably other vehicles but I'm sure I found out about it on this site a long time ago.
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Steam Vent "kit" options 
