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1995 993 Upper Engine Rebuild

Engine

Vehicle Information: Model: 1995 993 cab C2; Year: 1995; Body Type: Cabriolet; Total Mileage: apx 150,000;

Apx 2 years ago, I down shifted to second gear instead of 4th from 6th gear and over reved at 80mph. Since then rough engine idle. Just barely failed CA smog check (too rich). The check engine lite has NOT come on. Recent compression check shows 2 cyls at 50 while other 4 at 200.I most likely need a valve job. Not sure what the difference between the valve job and upper engine rebuild is.1) What's the difference?2) Does upper engine rebuild include new lifters and is a complete upper rebuild recommended considering the mileage?3) Would it be adviseable to also get the rings replaced also?4) Most importantly, can you refer a good Independent Mechanic in the Westlake Village/Thousand Oaks/Calabassas area (or within 30 miles of Westlake Village)?Thanks in advance,Bj

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