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ok I'm closing the door on the Porsche thing for a while so I'll put these back up for sale.. don't ask me to guarantee mileage.. I don't know, I also don't know who did the work. they are 930 heads ported in great condition, twin plugged, stout springs, ti retainers. intake port is 40mm at the opening, tapering to 35mm at the bottom of the throat, beautifully done. $1700 firm
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