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911 1974 Cam Timing, 2.7s w/sc cams

Engine

Vehicle Information: Model: 911s; Year: 1974; Body Type: Coupe; Total Mileage: 160,000;

I have a '74 911s in witch the cams have been reground to 911sc specs, Elgin Cams reground them. Right now I have them timed with 1.0mm overlap per '78 911sc specs. I understand that some people like to time this setup at 1.5mm overlap. Do you have a recommendation for the best timing for these cams in a '74 911s?Thank you.

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