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All motors had a desmodromic valvetrain, liquid-cooling, and fuel injection. The ST2 had a 2-valve motor (such as from the later 900SS). The ST3 had a 3-valve motor (and two spark plugs per cylinder), and the ST4 had a 4-valve motor taken from the 916.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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