Agree on cam timing. 6.6 deviation is technically out of spec but drivable. I don't know if that's your problem but it looks like your mechanic just threw a used head in there, including the used tensioner ramps which would explain the big timing error. My inderstanding is that if the ramps are worn, the mechanical cam timing can be perfect but it will still have a big deviation on durametric.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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