I have checked straigtness of the manifold, It is ok.
The Gaskets I have bought from NISMO are some sort of paper construction. They became hot and brittle. after removing they crumbled in my hand. This process started when I need to change my head gasket over the winter. The manifold gasket I removed was more of a graphite with metal layers, but I do not know who made it, that is why I thought I'll just get one from NISMO can't go wrong. WRONG! So now with manifold off for the 3rd time I really wanna find a gasket that will work. I contacted SCE gaskets they recommended making me a graphite gasket but wanted $300.00 to draw it. Fel-Pro seems to make a gasket that is getting mixed reviews. Does anyone else have a suggestion. If so include where to get. Also I have a P90 head with square exhaust ports.
THANKS