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To the best of my knowledge the only 2.7L that came with 32mm ports is the 911/91 made in 74 only (God knows why). 150 hp with CIS & 8:1 compression.
If there is no S/N chances are good that it is a replacement case (I had a 2.4L like that at one time) Look below & to the right on top of the case (bout 3-4 inches)of where the s/n should be for the type number....that will also be missing if it is a replacement.
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JPIII
Early Boxster
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