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This is correct. The thickness of the clamping surfaces must be the same.
It also helps to tighten the
bottom clamp between the manifolds first. The intake will hang up on the
pin between the intake ports
and not let the bottom of the intake seat all the way. Sometimes the hole
for the pin is too tight.
Dean
On Wed, Apr 9, 2025 at 8:41=E2=80=AFAM yellow04 via Fot <fot@autox.team.net=
> wrote:
> 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 lowe=
r
> mounting stud and clamp. I have found if you use anything other than a
> stock 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 res=
ts
> on the appropriate bits of the intake and exhaust manifold, when the nut =
is
> tightened it puts equal pressure on both manifolds. Obviously, the mounti=
ng
> face on each manifold needs to be flat. Assuming you have everything in
> order, there is no reason a stock manifold gasket will not work, I have r=
un
> 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
> loosening 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, failure 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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>
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>
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<div dir=3D"ltr">This is correct. The thickness of the clamping surfaces mu=
st be the same. It also helps to tighten the<div>bottom clamp between the m=
anifolds first. The intake will hang up on the pin between the intake ports=
</div><div>=C2=A0and not let the bottom of the intake seat all the way. Som=
etimes the hole for the pin is too tight.</div><div><br></div><div>Dean</di=
v><div><br></div></div><br><div class=3D"gmail_quote gmail_quote_container"=
><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Apr 9, 2025 at 8:41=E2=80=AF=
AM yellow04 via Fot <<a href=3D"mailto:fot@autox.team.net";>fot@autox.tea=
m.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><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 lo=
wer mounting stud and clamp. I have found if you use anything other than a =
stock intake manifold and stock exhaust manifold, you must scrutinize the a=
rea where the clamps will sit to ensure the height is very similar. Or, mod=
ify 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 t=
ightened it puts equal pressure on both manifolds.=C2=A0Obviously, the moun=
ting face on each manifold needs to be flat. Assuming you have everything i=
n order, there is no reason a stock manifold gasket will not work, I have r=
un them when I could not get my hands on the HD gaskets and they worked fin=
e for me.=C2=A0</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"m_5734550077102634702signature">=C2=A0</div>
<p><br></p>
<p id=3D"m_5734550077102634702reply-intro">On 2025-04-09 06:55, vfracing---=
via Fot wrote:</p>
<blockquote type=3D"cite" style=3D"padding:0px 0.4em;border-left:2px solid =
rgb(16,16,255);margin:0px">
<div id=3D"m_5734550077102634702replybody1">
<div>
<div style=3D"font-family:arial;font-size:16px">
<div>=C2=A0</div>
<div dir=3D"ltr">Lyman;</div>
<div dir=3D"ltr">=C2=A0</div>
<div dir=3D"ltr">=C2=A0another possible cause is a mis match in the thickne=
sses of the intake and exhaust manifold flanges.</div>
</div>
</div>
</div>
</blockquote>
</div>
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<br>
<br>
</blockquote></div>
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