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What does "blowing out" mean for an intake gasket?
Is it just falling apart from lack of support/clamping?
Or, is it pressure from a return pulse due to valve closing?
Or, is it lots of backfiring?
________________________________
From: Fot <fot-bounces@autox.team.net> on behalf of yellow04 via Fot <fot@a=
utox.team.net>
Sent: Wednesday, April 9, 2025 8:33 AM
To: FOT <fot@autox.team.net>
Subject: Re: [Fot] TR intake gaskets
My money is on this one... Blowing out the bottom of the intake gaskets mea=
ns you didn't get nearly enough pressure (if any) from that pesky lower mou=
nting stud and clamp. I have found if you use anything other than a stock i=
ntake manifold and stock exhaust manifold, you must scrutinize the area whe=
re the clamps will sit to ensure the height is very similar. Or, modify the=
clamps by welding on something to make sure when the clamp rests on the ap=
propriate bits of the intake and exhaust manifold, when the nut is tightene=
d it puts equal pressure on both manifolds. Obviously, the mounting face on=
each manifold needs to be flat. Assuming you have everything in order, the=
re is no reason a stock manifold gasket will not work, I have run them when=
I could not get my hands on the HD gaskets and they worked fine for me.
Last thought, the nuts that hold the manifolds on are notorious for looseni=
ng up in time, and especially after the first few heat cycles. And with eve=
rything installed, getting to the two bottom nuts can be a pain. But, failu=
re to keep them properly torqued leads to blown out gaskets.
On 2025-04-09 06:55, vfracing--- via Fot wrote:
Lyman;
another possible cause is a mis match in the thicknesses of the intake and=
exhaust manifold flanges.
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What does "blowing out" mean for an intake gasket?</div>
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s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Is it just falling apart from lack of support/clamping?</div>
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s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
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s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Or, is it pressure from a return pulse due to valve closing?</div>
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s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
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Or, is it lots of backfiring?</div>
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s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
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<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Fot <fot-bounces@a=
utox.team.net> on behalf of yellow04 via Fot <fot@autox.team.net><=
br>
<b>Sent:</b> Wednesday, April 9, 2025 8:33 AM<br>
<b>To:</b> FOT <fot@autox.team.net><br>
<b>Subject:</b> Re: [Fot] TR intake gaskets</font>
<div> </div>
</div>
<div style=3D"font-size:10pt; font-family:Verdana,Geneva,sans-serif">
<p>My money is on this one... Blowing out the bottom of the intake gaskets =
means you didn't get nearly enough pressure (if any) from that pesky lower =
mounting stud and clamp. I have found if you use anything other than a stoc=
k intake manifold and stock exhaust
manifold, you must scrutinize the area where the clamps will sit to ensure=
the height is very similar. Or, modify the clamps by welding on something =
to make sure when the clamp rests on the appropriate bits of the intake and=
exhaust manifold, when the nut
is tightened it puts equal pressure on both manifolds. Obviously, the=
mounting face on each manifold needs to be flat. Assuming you have everyth=
ing in order, there is no reason a stock manifold gasket will not work, I h=
ave run them when I could not get my
hands on the HD gaskets and they worked fine for me. </p>
<p>Last thought, the nuts that hold the manifolds on are notorious for loos=
ening up in time, and especially after the first few heat cycles. And with =
everything installed, getting to the two bottom nuts can be a pain. But, fa=
ilure to keep them properly torqued
leads to blown out gaskets.</p>
<div id=3D"x_signature"> </div>
<p><br>
</p>
<p id=3D"x_reply-intro">On 2025-04-09 06:55, vfracing--- via Fot wrote:</p>
<blockquote type=3D"cite" style=3D"padding:0 0.4em; border-left:#1010ff 2px=
solid; margin:0">
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<div class=3D"x_v1ydpc0738470yahoo-style-wrap" style=3D"font-family:arial; =
font-size:16px">
<div> </div>
<div dir=3D"ltr">Lyman;</div>
<div dir=3D"ltr"> </div>
<div dir=3D"ltr"> another possible cause is a mis match in the thickne=
sses of the intake and exhaust manifold flanges.</div>
</div>
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