remove the engine hat, clean where it contacts the top of the engine, remove any bits of old gasket if its rank. You want two smooth surfaces, get a new gasket, bit of gasket goo, and tighten it down. Torque doesnt matter as it just a "hat". Just make sure its tight and you are good to go. Personally i'd put my money elsewhere as this wont affect performance. Just take ya old one off do the gasket and put a coat of heat resistant paint on it if ya wanna be fancy.