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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
and have torqued down the heads with the gaskets but then a friend told me I must use a copper gasket with aluminum heads?? I am also not sure if the above gasket kit is copper or steel.
well ... the gasket you should use has a copper wire fire ring instead of steel.. it's not that the gasket is copperhowever felpro makes a preflattened steel fire ring gasket that minimizes brineling....you can use plan gaskets BUT it WILL brinell the head.. meaning it will put a mark in your new alluminum head where the fire ring isi prefer using the copper wire gasket that eliminates marring the head part number 1011-2.