[Fot] Help with 89mm head gasket

[Bob Kramer]

I think a lot of us use a thin copper wire to seal the combustion chamber
when using the shim steel gaskets. The protrusion has to be less for this
than if it was used without the wire. That may make up the difference
between the two recommendations. As we've discussed, I use
Gasgacinch around the water and oil passages on the steel gasket, and it
helps, but isn;t a cure. Although it seems counterintuitive to cut more off
the gasket, the stamped gasket compresses a little and the hope is that we
get the edges all lined up. The steel gaskets will raise compression a
little more than the Lucas or Cometic.

Bob Kramer


On Mon, Dec 23, 2024 at 7:56 AM fubog1 via Fot <fot at autox.team.net> wrote:

> I'm not sure about that spec, .005-.007 proud is for stock gaskets, I use
> .002-.003 for the steel shim gasket, which is all that I use on the race
> engines.
> Any more than .003 & the head won't clamp down good around the oil & water
> passages, at least that's been my experience.
> Merry Christmas!!!
>
> Glen Efinger
>
> On Monday, December 23, 2024 at 08:02:36 AM EST, Philip Gott via Fot <
> fot at autox.team.net> wrote:
>
>
> Merry Christmas!
> The composite gasket can not be cut back.
> The steel shim gasket can -and must be cut back as you describe.  Best to
> err on the side of taking too much off rather then not enough. We have had
> good luck using (and re-using) these with Hylomar.  The cylinder liners
> should protrude above the block .005 to .007 or the seal will be “iffy.”
> Phil Gott
>
> Sent from my iPhone
>
> > On Dec 22, 2024, at 11:30 PM, Greg Blake via Fot <fot at autox.team.net>
> wrote:
> >
> > So I’m building my first 89mm motor. Before you flame me, it’s a hot
> street motor.
> >
> > The head has been skimmed enough to remove the intake shroud. I have a
> Lucas brand big bore head gasket. It is a composite gasket with a steel
> fire ring. That fire ring hangs into the combustion chamber all around the
> intake valve. I don’t know if that Lucas gasket can be trimmed or otherwise
> modified to be able to work with this combination. So that’s question one.
> >
> > I also have a bunch of old stock steel shim head gaskets. The pictures
> below are of that gasket sitting on the head on the work bench. You can see
> it hangs into the combustion chamber as well but only about 0.010”. It’s
> the piece of metal that is inside of the fire ring. It looks like I could
> easily trim that with a flap wheel and have no part of the gasket in the
> combustion chamber. So that’s question number two. Is that the remedy for
> the shim steel gasket.
> >
> > Last question. I’ve never used a shim steel. Do I still go for 3-5 thou
> protrusion and then coat with copper coat?
> >
> > Thanks folks and merry Christmas 🎁
> >
> > <image0.jpeg>
> > <image1.jpeg>
> > <image2.jpeg>
> >
> >
> >
> > Sent from my iPhone_______________________________________________
> > fot at autox.team.net
> >
> > http://www.fot-racing.com
> >
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