need one of these stove pipes,I am doing the intake befor I install an engine and would like to take all precautions to avoid another wiped out motor. The engine I an removing has a 2004 UIM so as I look at it , it looks like they never did the LIM hence the motor fried.The engine I am putting in is a 1997 GP engine with 78000 miles. So I would guess I want to use the newer UIM if in good condition and the Stove pipe from the engine I am removing becasus it is from an 2001 GP with the smaller od stove pipe? Can How long does the 7/8 in sleeve need to be and does it have a shoulder? I would in a tubing plant so I can get whatever I need ? If not I will buy one... The 04 is stamped on the engine UIM in the car it is from a 2001 GP. The car is a 1995 Bonneville. I hope this straightens out this post. Thanks

Your post is hard to understand. Please read this and update your post accordingly:

http://www.bonnevilleclub.com/forum/...ic.php?t=73691

Are you using an engine from a 96 Grand Prix? That'd be tough since the 3800 didn't start in GPs until 1997.

What'* the 2001 GP engine in reference to?

Please start by reading the Techinfo article on this common problem: http://www.bonnevilleclub.com/forum/...e=article&k=38

The stovepipe bore in a 95-98 LIM is .750" - the stovepipe bore in 99 and newer LIMs is .625". Assuming the LIMs are stock, the pipes will not swap. You can make an adapter for the smaller pipe to fit the larger bore.

Old UIMs need to be carefully examined for warpage at the throttle body and on the coolant passage / EGR bore sealing surfaces with a straightedge. The EGR bore must be aggressively probed with a sharp instrument like a dental pick, or an upholstery needle held with vise-grips. Probe the outside top surface of the UIM to determine what the plastic should feel like when it is undamaged by exposure to heat. Then probe the interior of the EGR bore, especially near the bottom. If the EGR bore is noticeably softer, you would be wise to buy a new APN upper kit. If the bore is sound and the sealing surfaces are good, you can install a heat shield and a smaller diameter stovepipe to effect a lasting fix.

I have a few prototype shielded stovepipes left and could provide you with one to fit your 95-98 LIM. They are described here: http://www.bonnevilleclub.com/forum/...ic.php?t=70553 If your UIM is in good shape and you want to try one of these, PM me.

If you work in a tubing plant, perhaps you could help us all by obtaining some thin wall (.020") stainless with an outside diameter that will allow it to be press-fit into the EGR bore of a new Dorman UIM. Does your plant have those capabilities? If so, please PM me to discuss.

In the absence of custom-drawn tubing, we have been using .035" wall 304 stainless tubing .875" OD and .805" ID. The height needed to cover the plastic is .820". A shoulder is not easily managed because the base of the EGR passage in the UIM is closely surrounded by a silicone bead seal in the UIM gasket. The plastic EGR bore in the UIM needs to be enlarged carefully so that the coolant passages are not breached and the sleeve installed with regular JB weld. This provides a heat shield in the bore with an ID of .805"

You can make a stovepipe by pressing a ring of heavy wall .750 OD seamless stainless steel tubing onto a smaller 5/8" pipe and driving into your LIM bore. These procedures including sources of supply are described in various threads that are archived here on BC.

I am going to try and sleeve the uim and see if I am happy with it , IF not I will be sending for one of yours. I do work in a tubing plant, however we do not run stainless tubing. Only Hot rolled and cold rolled. Some CRCQ... I can however get it zinc plated which offers some corrosion resistance. I can have the ID flash controled to .005 or less. The only other option in steel would be G-60 Galvanized steel..

Bill Buttermore doesn't sleeve the intakes. Bob Dillon does. And he has a dozen or so in stock ready to ship for $60. Bill Buttermore, however, is the man for the reduced-diameter stovepipes.

Well, technically, I do sleeve intakes - one at a time as I need them and to test new materials and methods. But, willwren is right that I do not do them for sale like Bob Dillon is set up to do.

As far as I know, I'm the only one on the club running a "Buttermore" intake Correct me if I'm wrong, Bill.
She'* still holding up well after a year.

Ok, sorry, back on topic!

Jeez, Bob, you would have to count my car, too. It'* on UIM #6 or #7, serving as a test bed for different materials and methods for sleeves, shields, pipes, and vapor control. While I don't sleeve UIMs for others, there are a bunch of members running sleeves, pipes, shields, and shielded pipes mailed out from Ames. All I can say is: If I were in business doing this, I would certainly be in bankruptcy!