| Re: [GMCnet] Cracked intake [message #63646] |
Mon, 09 November 2009 22:14  |
chip
Messages: 37
Registered: November 2009
Karma: -2
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Member |
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Rob - thanks for all the help. Thanks also to Mike and Fred for
their input. Will get it out this weekend and
check out the manifold ... I have the carb off now - think I see a
hairline crack in the secondaries but not for sure ...
Thanks averyone! BODY { font-family:Arial, Helvetica,
sans-serif;font-size:12px; }
Chip
1977 Clasco
On Mon 09/11/09 3:38 PM , "Rob Mueller" robmueller@iinet.net.au
sent:
Chip,
On a final note I would HIGHLY recommend that when you do decide to
block
the crossovers that you do it when you have plenty of time to figure
out
what you want to address the problem if you find it cracked.
You have a number of options if you find your manifold cracked:
1) Weld repair the cracks
Comment: will it really seal properly and how long will it last?
2) Find a replacement manifold
Comment: If you get one off another GMC it probably is also cracked!
Try to find one off a Toronado.
3) Install an aluminum manifold from Edelbrock
Comment: their manifold is higher and you will have to build a dog
house on the engine cover for the carb / air cleaner to fit into.
4) Install an aluminum manifold from Gary Rockwell
Comment: they cost $600!
I am of the opinion that at this point in time a great majority of
GMC's
that don't have the crossover blocked have cracked intake manifolds
but the
owners don't know it!
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [1]
[gmclist-bounces@temp.gmcnet.org [2]] On Behalf Of chip@mach3isp.com
Sent: Tuesday, 10 November 2009 10:04 AM
To: gmclist@temp.gmcnet.org [3]
Subject: Re: [GMCnet] Cracked intake
Thanks Rob. Sounds like the Dick Paterson gaskets / block off's
should take care of me.
Appreciate the info / help !
Chip
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| Re: [GMCnet] Cracked intake [message #65555 is a reply to message #65543] |
Tue, 24 November 2009 15:48  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Larry,
The cracks are pretty obvious and with just a little cleaning you
should be able to see them. Blocking the Xovers and using air and
soap is an excellent idea. If you have one that isn't cracked, tank
it, blast it, paint it and instally it using composition gaskets and a
Mondello lifter valley baffle. Much better setup than the turkey
tray. You can make your own block off plates with a couple small
pieces of SS sheet metal. Use 3M super trim adhesive to hold them to
the block, then install the gaskets over them. If you bevel the
edges, they will seal better. I just pulled the intake from my old
engine and after about 40,000 miles, the SS plates have zero
corrosion. Had to use a sharp tool to pry them off the intake..
On Tue, Nov 24, 2009 at 12:54 PM, Larry Davick <ljdavick@comcast.net> wrote:
>
>
> I'm thinking of installing new intake manifold gaskets with the stainless steel blocking plates. Something I don't remember reading here is what to do with the manifold once you have it off.
>
> Should I send the manifold to be hot-tank dipped and beadblast, or sandbalsted?
>
> Mangaflux?
>
> Should I just scrape off the gunk as best as possible and look for cracks?
>
> What about the turkey-tray - should I even disturb it, or leave it in place?
>
> I see that Jim K has used manifolds for sale, so if mine is cracked I may just go that route.
>
> Thanks!
> --
> Larry Davick
> The Mystery Machine
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Cracked intake [message #65561 is a reply to message #65555] |
Tue, 24 November 2009 16:48 |
 |
ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Funny - I hadn't considered that the cracks generally occur in the crossovers. That pressure test sounds like a great idea.
Larry Davick
The Mystery Machine
----- Original Message -----
From: "Steven Ferguson" <botiemad11@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, November 24, 2009 1:48:51 PM GMT -08:00 US/Canada Pacific
Subject: Re: [GMCnet] Cracked intake
Larry,
The cracks are pretty obvious and with just a little cleaning you
should be able to see them. Blocking the Xovers and using air and
soap is an excellent idea. If you have one that isn't cracked, tank
it, blast it, paint it and instally it using composition gaskets and a
Mondello lifter valley baffle. Much better setup than the turkey
tray. You can make your own block off plates with a couple small
pieces of SS sheet metal. Use 3M super trim adhesive to hold them to
the block, then install the gaskets over them. If you bevel the
edges, they will seal better. I just pulled the intake from my old
engine and after about 40,000 miles, the SS plates have zero
corrosion. Had to use a sharp tool to pry them off the intake..
On Tue, Nov 24, 2009 at 12:54 PM, Larry Davick <ljdavick@comcast.net> wrote:
>
>
> I'm thinking of installing new intake manifold gaskets with the stainless steel blocking plates. Something I don't remember reading here is what to do with the manifold once you have it off.
>
> Should I send the manifold to be hot-tank dipped and beadblast, or sandbalsted?
>
> Mangaflux?
>
> Should I just scrape off the gunk as best as possible and look for cracks?
>
> What about the turkey-tray - should I even disturb it, or leave it in place?
>
> I see that Jim K has used manifolds for sale, so if mine is cracked I may just go that route.
>
> Thanks!
> --
> Larry Davick
> The Mystery Machine
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
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_______________________________________________
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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