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One note of caution on the Remflex gaskets. The pre-made ones have
holes for the intakes that are - to me - too large for the narrow
sealing surface of my weber cannon manifold. I buy uncut material from
them and then cut to size using a sharp knife. That way the intake
holes are exactly the same ID as the holes in the head and I get max
sealing surface. I think they are fine for stock intake manifolds.
I asked them about making ones with smaller holes and they were willing
to do that if I paid the tooling costs (which weren't horrible). I
declined and just make my own gaskets.
I am a big fan of their gaskets. They are not reusable generally if you
care about that (I don't).
If you look at the picture shared of the blown out gasket you can see
that the lower flange of the intake manifold had very little overlap
with the gasket.
Cheers, Tony Drews
On 4/9/2025 9:08 PM, Lyman Scherer via Fot wrote:
> Philâ?¦ pretty sure you are correct on the mis-match of clamping,
> headers are a mess, intakes ok. All sealing surfaces are good & flat.
> Going to start from scratch. Remflex gaskets, nice 3/8 shoulder bolts
> I have, fab new cross clamps, service headers even though had no
> exhaust leaks. Thx for advice!
> Sent from my iPhone
>
>> On Apr 9, 2025, at 7:46â?¯AM, Bob Kramer via Fot <fot@autox.team.net>
>> wrote:
>>
>> 
>> Getting to the two bottom nuts gets even more difficult when you add
>> a support bracketing to take the place of the OEM bolting of the
>> intake to the exhaust manifold that we lose when using a header, thus
>> it is easier to get it wrong.
>>
>> On Wed, Apr 9, 2025 at 7:48â?¯AM 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 lower 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 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 everything in order, there 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 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;
>>> Â 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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>
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<p>One note of caution on the Remflex gaskets. The pre-made ones
have holes for the intakes that are - to me - too large for the
narrow sealing surface of my weber cannon manifold. I buy uncut
material from them and then cut to size using a sharp knife. That
way the intake holes are exactly the same ID as the holes in the
head and I get max sealing surface. I think they are fine for
stock intake manifolds.</p>
<p>I asked them about making ones with smaller holes and they were
willing to do that if I paid the tooling costs (which weren't
horrible). I declined and just make my own gaskets.</p>
<p>I am a big fan of their gaskets. They are not reusable generally
if you care about that (I don't).</p>
<p>If you look at the picture shared of the blown out gasket you can
see that the lower flange of the intake manifold had very little
overlap with the gasket.<br>
</p>
<p>Cheers, Tony Drews<br>
</p>
<div class="moz-cite-prefix">On 4/9/2025 9:08 PM, Lyman Scherer via
Fot wrote:<br>
</div>
<blockquote type="cite"
cite="mid:152F3E03-1B68-4178-BB28-9DFEF17AE9D5@yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Philâ?¦ pretty sure you are correct on the mis-match of clamping,
headers are a mess, intakes ok. All sealing surfaces are good
& flat. Going to start from scratch. Remflex gaskets, nice 3/8
shoulder bolts I have, fab new cross clamps, service headers even
though had no exhaust leaks. Thx for advice!<br
id="lineBreakAtBeginningOfSignature">
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Apr 9, 2025, at 7:46â?¯AM, Bob Kramer
via Fot <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Getting to the two bottom nuts gets even
more difficult when you add a support bracketing to take the
place of the OEM bolting of the intake to the
exhaust manifold that we lose when using a header, thus it
is easier to get it wrong.</div>
<br>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Wed, Apr 9, 2025 at
7:48â?¯AM yellow04 via Fot <<a
href="mailto:fot@autox.team.net"; moz-do-not-send="true"
class="moz-txt-link-freetext">fot@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div
style="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 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 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 everything in order, there 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. </p>
<p>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.</p>
<div id="m_8205082758269726652signature">Â </div>
<p><br>
</p>
<p id="m_8205082758269726652reply-intro">On 2025-04-09
06:55, vfracing--- via Fot wrote:</p>
<blockquote type="cite"
style="padding:0px 0.4em;border-left:2px solid rgb(16,16,255);margin:0px">
<div id="m_8205082758269726652replybody1">
<div>
<div style="font-family:arial;font-size:16px">
<div>Â </div>
<div dir="ltr">Lyman;</div>
<div dir="ltr">Â </div>
<div dir="ltr">Â another possible cause is a mis
match in the thicknesses of the intake and
exhaust manifold flanges.</div>
</div>
</div>
</div>
</blockquote>
</div>
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