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Porsche 911 SC

Engine

Vehicle Information: Year: 1979; Body Type: Coupe;

I was having a 1979 911SC for PPI which it did very well, but surprisingly the leak down test didn't do so well. Supposedly the engine had rings done at at approx. 85,000 mi. as well as a valve job, and engine studs. The first three cyl's were at 0%, 2%, 1%, then 4-cyl. was 11%, 5-cyl. was at 34%, and cly. # 6 was back to 1%. So four of the cylinders were excellent except for the other two. Is it possible that a piece of carbon may have got stuck between the exhaust vale and it's seat, and giving the bad readings? I spoke to numerous people who said sometimes these air cooled cars run great, but fail the leakdown. They told me you could try using techron to dissole the deposits and take it for a good run and then recheck.Anyway, what do you think, and do these CIS injection engiges need alot of adjusting, or should I just spend the extra money and get a carrera with the more advanced injection and better transmission?Thank-you

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