| Intake gaskets [message #186440] |
Fri, 05 October 2012 02:57  |
RICKUS
Messages: 19
Registered: August 2012
Location: Stockton Ca
Karma: 0
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Junior Member |
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Hi all ..I pulled the heads off my 455 today , not happy with the carbin buildup under the intake .. will the intake blockoffs fix this??? pros /cons help thanks Rickus
Rick Braley 1974 26" Sequoia Stockton Ca.
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| Re: [GMCnet] Intake gaskets [message #186449 is a reply to message #186441] |
Fri, 05 October 2012 08:35  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Gene,
I read the information very carefully and would like to comment. Plugging the crossovers with Mondello or Paterson block off plates
is OK if only the bottom of the crossover passage that is exposed to the lifter valley is cracked. If BOTH the passage exposed to
the lifter valley AND the bottom of the carb plenum is cracked will keep exhaust gasses out of the lifter valley, however, it would
be possible (depending on how big the crack is) for engine vacuum to draw oil vapors from the lifter valley into the carb plenum. It
would be a vacuum leak at the very least.
We are back in Houston and i have a cracked manifold that the crossover will be filled with Hard Blok. This is the material that the
drag racers fill their engine blocks with in lieu of water.
I am hoping that a manifold with a cracked crossover filled with Hard Blok stop oil vapors from being sucked into the carb plenum
and stop vacuum leaks.
Hopefully I'll have time to get to it with all the other stuff I have to do between now and Oct 22nd when I fly out.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of gene Fisher
Sent: Friday, October 05, 2012 2:05 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Intake gaskets
Yes it will,
and read here
http://gmcmotorhome.info/radiator.html#block
using the OEM manifold is a good way to go
gene
On Fri, Oct 5, 2012 at 12:57 AM, Rickus <rbraley5@hotmail.com> wrote:
>
>
> Hi all ..I pulled the heads off my 455 today , not happy with the carbin
> buildup under the intake .. will the intake blockoffs fix this??? pros
> /cons help thanks Rickus
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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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| Re: Intake gaskets [message #186456 is a reply to message #186440] |
Fri, 05 October 2012 10:27 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| RICKUS wrote on Fri, 05 October 2012 02:57 |
Hi all ..I pulled the heads off my 455 today , not happy with the carbin buildup under the intake .. will the intake blockoffs fix this??? pros /cons help thanks Rickus
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YES.
The purpose of the plates is to greatly reduce the temperature of the intake manifold. The prevents several things.
1. Boiling gas in the carb especially on shut down.
2. Carbonizing of coil on the bottom of the manifold.
3. Cracking of the manifold from over heating.
It will also help in some cases of vapor lock problems.
You will have to make some allowance for your current hot air choke. Either go to electric or wrap a piece of copper tubing around the exhaust for a heat source for the choke.
While you have the manifold off, inspect it very closely for signs of cracking in the area directly below the carb. I sand blasted mine and repainted it but that is not entirely necessary but it make is much easier to inspect after it is cleaned up for painting.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Intake gaskets [message #186486 is a reply to message #186456] |
Fri, 05 October 2012 16:56 |
RICKUS
Messages: 19
Registered: August 2012
Location: Stockton Ca
Karma: 0
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Junior Member |
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THANKS EVERYONE I think i'm going to replace with a new alum intake , maybe not sure ?????
Rick Braley 1974 26" Sequoia Stockton Ca.
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| Re: Intake gaskets [message #186492 is a reply to message #186440] |
Fri, 05 October 2012 18:52 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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Rob,
I hope you do get a chance to try the Hardblock as that in combination with the block-off gaskets should be enough to use even a cracked manifold if my thinking is right. I can't imagine that a vacuum leak would make it around the Hardblock, but it will be a great project if it works.
Let us know if you do get a chance to give it a try.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: Intake gaskets [message #186507 is a reply to message #186486] |
Fri, 05 October 2012 21:53 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| RICKUS wrote on Fri, 05 October 2012 16:56 |
THANKS EVERYONE I think i'm going to replace with a new alum intake , maybe not sure ?????
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If you do, keep the old one. Lots of people would love to have it if it isn't cracked.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Intake gaskets [message #186509 is a reply to message #186507] |
Fri, 05 October 2012 22:02 |
RICKUS
Messages: 19
Registered: August 2012
Location: Stockton Ca
Karma: 0
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Junior Member |
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KEN I don't know what i'll'yet do , but i will keep that in mind ... thanks
Rick Braley 1974 26" Sequoia Stockton Ca.
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| Re: [GMCnet] Intake gaskets [message #186517 is a reply to message #186490] |
Sat, 06 October 2012 06:30 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Senior Member |
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If you hooked your ele choke up to a "keyed" source of 12vdc and do not
have an ele fuel pump. That delay that you experience while cranking the
engine to get fuel to the carb, and fill the float bowl is enough time for
the choke to start pulling off. A better source of 12vdc is the alternator
output lug. No 12vdc until the engine is running and that makes for a
slightly longer warm up period on before the choke pulls off.
On Fri, Oct 5, 2012 at 2:55 PM, jerrod winter <jerrod_beth@msn.com> wrote:
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> I replaced my cracked 403 intake manifold with an edelbrock intake with
> block off plates. I changed the choke over to an off the shelf electric
> choke. It works good in warm weather but in temps below about 40 F it is a
> cold blooded pig.
>
> If I set the choke good for warm weather, it pulls off way to fast in cold
> weather. I would recommend getting one of the "intake heat sensing chokes"
> instead of the "amperage heats the element type chokes". I plan to get one
> the next time I place an order with Jim.
> _______________________________________________
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>
--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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