A bit old of a thread, but Steve is right. The engine case is common for the 964, the 993, and the 996 Turbo (and gt2/3). All of these are dry sump engines, and share a common bolt pattern. The naturally aspirated 996 and 997 (and their Boxster equivalents use a different (but common among themselves) bolt pattern.
Last edited by vwdevotee; September 6th 2008 at 17:20.
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