The camshaft is located right in the middle of the engine. In order for the lobes on the cam to open the valves, there are lifters, which ride on the lobes of the cam, then pushrods that go to the rocker arms on top of the heads, which open the valves when they pivot on their base.
Ford started using the mod engine in 1991, but the Mustang didn't see it until 1996.
Take care,
-Chris
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