<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1446816007195_26397">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.</div><div id="yui_3_16_0_1_1446816007195_26694"><br></div><div id="yui_3_16_0_1_1446816007195_26695">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.</div><div id="yui_3_16_0_1_1446816007195_26696"><br></div><div id="yui_3_16_0_1_1446816007195_26697" dir="ltr">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.</div><div id="yui_3_16_0_1_1446816007195_26698" dir="ltr"><br></div><div id="yui_3_16_0_1_1446816007195_26699" dir="ltr">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.</div><div id="yui_3_16_0_1_1446816007195_26721" dir="ltr"><br></div><div id="yui_3_16_0_1_1446816007195_26722" dir="ltr">Jack Wheeler<br></div></div></body></html>