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CRACKED INTAKE MANIFOLD [message #67074]

Thu, 10 December 2009 09:47

Michael Bozardt

Messages: 367
Registered: January 2007
Location: College Station, Texas

Karma: 1

Senior Member

Cracked intake manifold-
One shop tech says it is not fixable because it is too far down near the crossover.

Another RV expert says if welded, the metal composition changes and another crack will result next to the weld.

Anyone have experience or knowledge about this please respond.
Thx, Michael at GEMRECS

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Re: [GMCnet] CRACKED INTAKE MANIFOLD [message #67077 is a reply to message #67074]

Thu, 10 December 2009 10:08

Terry Skinner

Messages: 379
Registered: January 2004

Karma: 0

Senior Member

I have welded cast using a NI-rod welding rod (very expensive) by back
welding and peening. Lots of work and expensive to have someone else
do it. Another method is to furnace braze it. Again expensive. Better
off to install one of the aluminum manifolds. Then you know it is done
right. Problem here is that all my suggestions are expensive.<G> Look
at the other side, when you sell your GMC that aluminum manifold will
give you a lot of bragging rights.<G>............Terry

On Thu, Dec 10, 2009 at 7:47 AM, Michael Bozardt <ilse@earth-comm.com> wrote:
>
>
> Cracked intake manifold-
> One shop tech says it is not fixable because it is too far down near the crossover.
>
> Another RV expert says if welded, the metal composition changes and another crack will result next to the weld.
>
> Anyone have experience or knowledge about this please respond.
> Thx, Michael � at � GEMRECS
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Terry Skinner
253-686-2624
Roy. Washington
'76 GMC
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Re: [GMCnet] CRACKED INTAKE MANIFOLD [message #67087 is a reply to message #67077]

Thu, 10 December 2009 10:51

ljdavick

Messages: 3548
Registered: March 2007
Location: Fremont, CA

Karma: -3

Senior Member

If the crack is only to the crossovers would it be effective to fill
the crossovers with zinc, lead, aluminum, or whatever folks are using
to fill these things? Then again if the crack is not localized to
the crossover you've wasted a lot of time and money.

Larry Davick
The Mystery Machine
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy

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Re: CRACKED INTAKE MANIFOLD [message #67095 is a reply to message #67074]

Thu, 10 December 2009 11:52

Bob de Kruyff

Messages: 4260
Registered: January 2004
Location: Chandler, AZ

Karma: 1

Senior Member

Mike---455 or 403?

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: CRACKED INTAKE MANIFOLD [message #67103 is a reply to message #67095]

Thu, 10 December 2009 13:55

John Sharpe

Messages: 489
Registered: February 2006
Location: Texas

Karma: 1

Senior Member

Bob, Mike's working on a 455.

John Sharpe
Humble,TX
'78 Eleganza TBI
'89 Spectrum 2000 MPI V-10
'40 Ford Panel Delivery TPI
johnasharpe@gmail.com

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Re: CRACKED INTAKE MANIFOLD [message #67109 is a reply to message #67103]

Thu, 10 December 2009 14:58

Bob de Kruyff

Messages: 4260
Registered: January 2004
Location: Chandler, AZ

Karma: 1

Senior Member

""Bob, Mike's working on a 455.""

Thanks John--my thought was if it is a 403, intakes are plentifull--no such luck I guess Smile

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: [GMCnet] CRACKED INTAKE MANIFOLD [message #67119 is a reply to message #67074]

Thu, 10 December 2009 16:01

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Michael,

As you know I faced this situation several months ago and decided to install
an aluminum manifold and be done with it.

I am of the opinion that a high percentage of intake manifolds on GMC's
crack because of the heavy load the engine has to pull. Who knows how many
you'll have to go through before you find a good one.

IMHO you have four options:

1) Keep checking GMC manifolds until you find one that is not cracked.
2) Find a manifold off a Toronado.
3) Get a used manifold from Jim K; he sells them for $180 and I assume that
is cleaned and crack checked.
4) Install an aluminum manifold

If you install a cast iron manifold I would block off the crossovers with
one of Dick Patterson's kit.

Rob "demonstrating an acute grasp on the obvious" Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Michael Bozardt
Sent: Friday, 11 December 2009 2:48 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] CRACKED INTAKE MANIFOLD

Cracked intake manifold-
One shop tech says it is not fixable because it is too far down near the
crossover.

Another RV expert says if welded, the metal composition changes and another
crack will result next to the weld.

Anyone have experience or knowledge about this please respond.
Thx, Michael at GEMRECS
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_______________________________________________
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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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