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The 'T' cylinders would be cast iron instead of Biral with aluminum fins. But, the cam lift at TDC overlap would be conclusive indication that 'T' cast pistons were't inside! The injection pump part number would also indicate an original 'S' pump put on a replacement case.
But, one drive around the block would tell for sure ... to someone who knows an 'S' engine characteristics!
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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler
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