| Re: [GMCnet] Cracked intake [message #63592] |
Mon, 09 November 2009 14:07  |
chip
Messages: 37
Registered: November 2009
Karma:
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Rob:
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Are you saying these are the correct gaskets for a 455 ? And they
will be adequate to block off the heat crossover
without filling it in ? Please advise, am new to this and in the
process of pulling my 455 for rebuild ...
Thanks - Chip
1977 Clasco
On Mon 09/11/09 11:56 AM , "Rob Mueller" robmueller@iinet.net.au
sent:
G'day,
Nope! The ports in a 403 are smaller than a 455.
I was shipped a set of Mr. Gasket intake gaskets for a 403 by a
supplier by
mistake. I didn't notice it until after I glued them down with
Gorilla snot.
I noticed that the valley gaskets were way too short and that
prompted me to
examine the installed gaskets. I could see cast iron around the
sides and
bottom of the port but not the top. I stuck my finger in the port
and could
feel the gasket extending down from the top of the port a bit. I
didn't
check how far as I was too busy cursing and ripping them off!
Fortunately
the Gorilla snot hadn't set up and I was able to peel them off and
scrap the
residue off the heads without too much bother.
I agree with Rick and I don't think it's necessary to use block off
plates
but if I were to do it again I would use these gaskets from
Edelbrock.
http://www.summitracing.com/parts/EDL-7284/?image=large [1]
Here's the text from the ad:
Brand: Edelbrock
Manufacturer's Part Number: 7284
Part Type: Intake Manifold Gaskets
Product Line: Edelbrock Intake Manifold Gaskets
Summit Racing Part Number: EDL-7284
Port Style: Stock
Port Height (in): 2.440 in.
Port Width (in): 1.440 in.
Gasket Material: Composite
Thickness (in): 0.060 in.
Quantity: Sold as a set.
Notes: Nitrile bead around port openings.
Produce maximum and efficient power with precise sealing.
Properly sealing an engine is paramount to making maximum
horsepower.
Edelbrock intake manifold gaskets are designed to give your manifold
and
cylinder heads an exact seal with their composite and steel core
construction.
Note the Nitrile bead and steel core!
Regards,
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 [2]
[gmclist-bounces@temp.gmcnet.org [3]] On Behalf Of Rick Denney
Sent: Tuesday, 10 November 2009 4:47 AM
To: Bob de Kruyff
Subject: Re: [GMCnet] Cracked intake
Bob de Kruyff writes...
> I could go with aluminum but then the next question is what are
the
> issues of blocking the crossover with an aluminum intake.
My understanding is that there is no issue. I added a layer of
safety
(literally) by using Dick Paterson's stainless-steel block-off
plates
to keep the surface of the aluminum from eroding. Those blocking
plates seem adequate to the task even for an unfilled iron manifold.
Doesn't the 403 use the same intake gaskets as the 455? I know the
intake itself is narrower.
Rick "belt and suspenders-heh" Denney
'73 230 Ex-Glacier "Jaws"
Northern Virginia
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Links:
------
[1] http://www.summitracing.com/parts/EDL-7284/?image=large
[2] mailto:gmclist-bounces@temp.gmcnet.org
[3] mailto:gmclist-bounces@temp.gmcnet.org
[4] http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
[5] http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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