Subject: [Fot] Help with 89mm head gasket

From: Greg Blake via Fot <[email-masked]>
Date: Sun, 22 Dec 2024 22:13:37 -0600

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So I=E2=80=99m building my first 89mm motor. Before you flame me, it=E2=80=99=
s a hot street motor.=20

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 val=
ve. I don=E2=80=99t know if that Lucas gasket can be trimmed or otherwise mo=
dified to be able to work with this combination. So that=E2=80=99s question o=
ne.=20

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 ha=
ngs into the combustion chamber as well but only about 0.010=E2=80=9D. It=E2=
=80=99s the piece of metal that is inside of the fire ring. It looks like I c=
ould easily trim that with a flap wheel and have no part of the gasket in th=
e combustion chamber. So that=E2=80=99s question number two. Is that the rem=
edy for the shim steel gasket.=20

Last question. I=E2=80=99ve never used a shim steel. Do I still go for 3-5 t=
hou protrusion and then coat with copper coat?

Thanks folks and merry Christmas =F0=9F=8E=81=20

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Sent from my iPhone
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