LS6 intake cracked!!

**yosteff** · 03-03-2011, 05:47 PM

I bought a used LS6 intake from a 2004 Corvette to put on my LS1 Camaro.
There is a smal crack in the rear of the Corvette intake ( look like somting rubed on it for some time).
I want to repaire it but i dont know how or with what.
Any tips to how to repaired Plastic intake??

**0rion** · 03-03-2011, 05:49 PM

they usually crack them trying to get the map sensor out.....you may be able to plastic weld or epoxy it depending on how big/bad it is.

**pajeff02** · 03-03-2011, 05:52 PM

How about a pic?

**yosteff** · 03-03-2011, 05:53 PM

yeah ..working on that..

**yosteff** · 03-03-2011, 06:08 PM

Damn photobucket..the pics are way to small to see anything!!
So check here on my cardomain page.

http://www.cardomain.com/ride/252827...-camaro/page-6
The crack is in the rear of the intake.

**5150** · 03-03-2011, 06:20 PM

I would use jb weld the quick set stuff. Make sure the surface is clean no oil film or anything like that.I'd also scuff up the surrounding area with some 100 grit sand paper to help the jb weld bite better. With the JB weld you shouldn't ever have to worry about it again. Good luck!

**0rion** · 03-03-2011, 06:36 PM

I can tell you what worries me about using epoxy or jbweld on it.....you gotta make sure that shit doesn't get sucked into the motor. I would probably make a small patch to go over that and epoxy around the patch. The worst your looking at there is a leak and it removes the chances of it sucking something into the motor.

**redbird555** · 03-04-2011, 04:05 AM

I wouldnt use jb weld we did it on a friend intake and while the crack was 4-5 inches long it wasnt as big as that and within a week the jb weld had cracked and fallen off. I'd go with some type of plastic weld thats made to expand and contract with the intake along with take the vibration of the motor.

**VENOMOUS** · 03-04-2011, 06:59 AM

3M makes a product called Duramix for repair of plastic parts in the automotve collision repair industry. There are two formulas, one for soft, flexible plastic, and the other for hard, rigid plastics. Try your local automotive paint shop and they should know what I am talking about. It does require a $300 gun to use it with, but being a 2 part product you can simply push an equal amount of each onto a piece of cardboard and mix, then apply. This stuff sets in about a minute so you don't have much time to mix and spread.

**5150** · 03-04-2011, 07:16 AM

I've used jb weld on countless things over the years. It never failed but I guess if u mix it wrong and or don't prep the surface right anything can happen. If u want 100% guarantee that it's not going to leak get one thats not damaged. 

**yosteff** · 03-04-2011, 10:11 AM

Originally Posted by 5150

I've used jb weld on countless things over the years. It never failed but I guess if u mix it wrong and or don't prep the surface right anything can happen. If u want 100% guarantee that it's not going to leak get one thats not damaged. 

I am in The French part of CANADA

and we dont have a multitude of place to get cheap used part.

so i was able to locate that one and pay only 50$ for with the injector and fuel rail...
cant beat that!!

**GOR1LA** · 03-04-2011, 10:44 AM

just fmi what caused said crack/hole?

**yosteff** · 03-05-2011, 10:21 AM

Git the intake from a guy who bought the corvette engine from the junk yard... look like something rube on it until it crack!!

**jg rider** · 04-17-2011, 11:15 AM

Hello I was browsing and I ran across this thread. What I did was weld a patch on top of a hole in my SLP LS6 manifold. I used the broken off piece and a soldering iron to weld it on. Then I used JB weld to cover the patched area.
I think you can just run a soldering iron to melt together the crack and then cover with JB weld

**KMdef9** · 04-17-2011, 02:27 PM

The crack below the bigger one needs attention too. That's looking to be alot of repair. I would almost looking into fiberglassing the whole back side of it. I know there's a product made specifically for plastic, but I can't recall what it was called. No matter what product you use, I would make sure it's rated for higher temperatures and plastics. Like mentioned before, preparation is critical.

Here's that other crack I was talking about:

**0rion** · 04-17-2011, 10:41 PM

Originally Posted by KMdef9

The crack below the bigger one needs attention too. That's looking to be alot of repair. I would almost looking into fiberglassing the whole back side of it. I know there's a product made specifically for plastic, but I can't recall what it was called. No matter what product you use, I would make sure it's rated for higher temperatures and plastics. Like mentioned before, preparation is critical.

Here's that other crack I was talking about:

looking at that picture again the gouge in the intake makes me think they did that pulling the motor from the top I bet.

**blackSS01** · 04-17-2011, 11:54 PM

Originally Posted by 0rion

I can tell you what worries me about using epoxy or jbweld on it.....you gotta make sure that shit doesn't get sucked into the motor. I would probably make a small patch to go over that and epoxy around the patch. The worst your looking at there is a leak and it removes the chances of it sucking something into the motor.

I didn't read all the replies but the last thing you want to do is blow the motor due to trying to patch something with a metal hardener! Metal sucked in = mass destruction unless very very lucky. Hope you get it all worked out OP

**yosteff** · 04-18-2011, 04:24 AM

Yep i have to found the right product.. dinth have time to get at it yet but will post some pics when it is done.. thanks guys for your help!!

**PFM** · 04-22-2011, 12:17 PM

You might have to drill a little hole at the ends of the crack to stop it from cracking futher. Once the end of the crack hits that round hole it don't know which way to go. I have also had very good luck with a soldering iron and black plactic tie wraps. They seem to be made out of the type of plastic. On a crack like you've got you might have to grind a grove in the crack so it so its a stronger bond.

**timowen1** · 04-25-2011, 03:26 PM

I only skimmed all the posts on this thread so I may have missed something.
Did you buy this thing with the crack or was it sold to you without you knowing about the crack? I would not use it. Parts may be hard to find but this thing is broken and always will be. You may be able to patch it and it may work but for how long? What will happen if it comes apart at 5,000 rpm?
If you got scammed I'd fight it and try to get my money back.