They may work, or may not. The biggest problem is that the fire ring
doesn't have the "mouse ears" that the composite gasket does, so if
the head is milled and the intake valve pocket is uncovered, the fire
ring intrudes into that. At Road America, Joe / Shawn's car had a
major head gasket leak and the source was the intake valve pocked on
#4 cylinder going slightly outside the fire ring on that gasket. Pop
the head, drop a Payen composite on and we had a GREAT battle afterwards.
I'm running the same gasket this year, will be going back to the
composite one. I think I've got a very slight head gasket leak, I
always end up with pressure in the radiator after a race weekend. If
the head has less milled and still has the intake valve shrouded they
should work much better.
Cheers, Tony Drews
At 01:13 PM 11/6/2015, Jack Wheeler wrote:
>Does anyone have any experience using Cometic head gaskets with the
>TR-3/4 engines? I have a slightly modified (10:1 compression with a
>cam) engine in my street TR-3. I built the engine about 2-3 years
>ago, and it runs great. However, it has always used water and
>eventually over heats, especially on real hot days, which we get a
>lot of in North Carolina. I have run a test on it, and the engine
>definitely has a compression leak.
>
>So, I removed the head and inspected the gasket. It is the stock
>copper gasket. There is no obvious indication of a leak around the
>gasket. I checked the liner protrusion and all were within spec
>(.003" - .005"). I have always used Gaskacinch sealant, and have
>never had one leak before.
>
>A friend of mine, who builds a lot of American engines (racing and
>otherwise) suggested I look into a Cometic head gasket. They are
>supposed to seal better than a copper gasket, though I don't know
>why. Sure enough, I looked up their web site and they have a gasket
>listed for the TR-4 engine (also one for the TR-6). My only concern
>is that it is listed as 88MM bore. I am using a new 87MM piston and liner set.
>
>If anyone has had any experience with these gaskets on the TR-3/4
>engines, I would really appreciate any feedback, both positive and
>negative. Thanks.
>
>Jack Wheeler
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