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If they are iron they are probably GT40 iron heads.
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I believe the iron heads have 3 bars on the outside ends of the casting (near the bottom), you might be able to see them.
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If they are aluminum then they are probably the GT40X.
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Could also be the GT40Y.
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1989 lx notch
89,000 miles
5-speed, bolt-ons, 3.73, TFS TWs, TFS Track Heat, TFS Stage 1 cam
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