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Todd: To answer your initial question, the thick flange SSIs are the correct ones for the 3.2 heads. Actually I don't think they would have worked with the 81 SC heads. The thick flange SSIs not only have the thicker flange, but they also have a short piece of pipe that extends above the flange and slips into the exhaust port on the head. I don't think that pipe extension would fit into the exhaust port on an SC head. Not entirely sure about that... but I'm certain the thick flange is correct for the 3.2 heads.
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1970 911E Sportomatic Albert Blue
1971 911T Sunroof Coupe w/ Twin Plug 2.5 MFI
1973 911E Glacier Blue
1973 911E RSR Tribute Viper Green w/ 3.5 Twin Plug MFI
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