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#4431786 - 06/14/17 09:15 PM GM LSx Exhaust manifold clamp fix. Works great!
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
So it is pretty common on the Truck motors to break the front and or rear most exhaust manifold bolt.
I knew it would happen on my truck eventually. Noticed it this past camping trip.

So the rear one on the passenger side and the front one on the drivers side broke. (They use the same clamp). It was nice because they broke off below the manifold. They have to be ground if they are not for this kit to work.

You can see the front drivers side one here.

The bolts are just too small to handle the heat cycles seen even in normal driving. Towing wears them out quick. It is only the outer most ones as they see the most flex
The bracket bolts into the head and use a bolt that you screw down to apply force on the manifold.
Sealed mine up first time because I caught it early. Some people do a few heat cycles and retighten the bolt this will usually seal it.
This is the Doorman clamp, probably one of the best things they make.

The large hole is to the clear the temp sensor on the drivers side.
Installed on the passenger side.


With the bolt that applies pressure.


Tons of LSx guys use them. 50 bucks VS pulling the heads and drilling them out. It is meant to be a permanent fix. We will see.
Some people already have 200,000 miles on them and they work great.
They make them for Dodge gassers and the Tundra too, none for Fords, but the Ford owners wish they did.
Nothing for the diesel. I guess they breaks exhaust manifold bolts also.
Towing is a tough duty cycle.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431818 - 06/14/17 09:55 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
9050lx Offline


Registered: 11/07/08
Posts: 114
Loc: FL
Slick idea!Wish I thought of it.

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#4431820 - 06/14/17 09:59 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
Kruse Offline


Registered: 10/05/05
Posts: 4294
Loc: Kansas
Originally Posted By: ls1mike
none for Fords, but the Ford owners wish they did.


I've got a high-mileaged Ford Ranger that had an exhaust manifold to y-pipe clamp bolt failure.
I was in no mood to pull the exhaust manifold off the engine to do a proper fix, so I experimented with this.
Works great, so far.

https://www.amazon.com/Exhaust-Stud-Clamp-Smaller-Cars/dp/B00E4TML46

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#4431823 - 06/14/17 10:05 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
Is this a problem on the 5.3's or just the 6.0?
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4431827 - 06/14/17 10:11 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: spasm3]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: spasm3
Is this a problem on the 5.3's or just the 6.0?

4.8, 5.3, 5.7 (LS1), 6.0, 6.2...Any LSx.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431829 - 06/14/17 10:15 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: spasm3]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: spasm3
Is this a problem on the 5.3's or just the 6.0?


Have you checked yours? I only found mine by accident. Wife started it and I heard a slight tick from outside. Checked it Sunday and found the broken stud/bolts. These worked awesome. I had both on in under 50 mins.
LOTS of guys are using them.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431831 - 06/14/17 10:16 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
I hate to look, but i will check this weekend.
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4431832 - 06/14/17 10:16 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: 9050lx]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: 9050lx
Slick idea!Wish I thought of it.

It really is, but you know model A's used a clamp system and not a stud. Works so much better.
I would bet money I never have to pull these off.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431833 - 06/14/17 10:17 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
Kibitoshin Offline


Registered: 04/19/16
Posts: 688
Loc: Kaiōshinkai
If you have the time I would change out the 10MM original manifold bolts to the newer 13MM bolts. I swapped them out in my truck as preventative maintenance and crossed my fingers to make sure none of them didn't snap.
_________________________
Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi

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#4431834 - 06/14/17 10:17 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: spasm3]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: spasm3
I hate to look, but i will check this weekend.

It is a really easy fix. They make them for every bolt on those manifolds.
It will cure any some leans conditions if the leak is bad, smooth out the idle and quiet it up.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431836 - 06/14/17 10:18 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: Kibitoshin]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: Kibitoshin
If you have the time I would change out the 10MM original manifold bolts to the newer 13MM bolts. I swapped them out in my truck as preventative maintenance and crossed my fingers to make sure none of them didn't snap.

Someday if I have to pull the heads. I will leave these on there for as long as can. Seems they work well for lots of people.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4431839 - 06/14/17 10:20 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: Kibitoshin]
ls1mike Offline


Registered: 06/14/08
Posts: 5104
Loc: In the Garage...
Originally Posted By: Kibitoshin
If you have the time I would change out the 10MM original manifold bolts to the newer 13MM bolts. I swapped them out in my truck as preventative maintenance and crossed my fingers to make sure none of them didn't snap.


Did they change the shaft size or just the head?
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

Top
#4431840 - 06/14/17 10:22 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
If mine are not broken, i wonder if ARP makes bolts that i could change out.
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4431841 - 06/14/17 10:27 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: ls1mike]
Kibitoshin Offline


Registered: 04/19/16
Posts: 688
Loc: Kaiōshinkai
Originally Posted By: ls1mike
Originally Posted By: Kibitoshin
If you have the time I would change out the 10MM original manifold bolts to the newer 13MM bolts. I swapped them out in my truck as preventative maintenance and crossed my fingers to make sure none of them didn't snap.


Did they change the shaft size or just the head?


Just the head size.
_________________________
Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi

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#4431895 - 06/14/17 11:57 PM Re: GM LSx Exhaust manifold clamp fix. Works great! [Re: spasm3]
oldhp Offline


Registered: 06/28/12
Posts: 1621
Loc: USA
"If mine are not broken, i wonder if ARP makes bolts that i could change out."

I would use ARP studs with fine thread nuts. Screw them in hand tight after chasing the threads, if they break now, should come out easy. Cheers1
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