If you have bolt holes on the center iron chances are its a S4 and they just swapped out the oil pan and front cover with a S3 (GSL-SE). Another way to tell would be to look at the top of the center iron for an EGR (exhaust recirculation valve), If it has one of these chances are its a S4. Do you have any pics of the block that might help Identify it?
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Rollin like a reuleaux. Unstoppable.
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