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Message: <blockquote data-quote="remow2112" data-source="post: 804042" data-attributes="member: 13780">I just scored a 1995 Mustang GT. It has the following items: E303 cam, 1.7 rockers, Cobra intake, plenum and aluminum heads. The guy I got it from had a ford tech who put the stuff on from a his busted up Cobra. Long story short. I believe they are gt40x heads. Without tearing into the engine I used a mirror and I can see Ford racing on the front of the driver side head. Is there any way to determine they are gt40x heads without pulling a valve cover? The car idles some what rough. When I started pulling the spark plugs I discovered that it has autolite 25 plugs. Which is great for a stock 1995 gt but is the wrong plug for the gt40x heads. I bought the autolite 104s to put in but I would like to verify the heads before I commit to the plugs. Thanks all!Dan...</blockquote>