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Late SCs are timed with the vacuum line disconnected. I think early SCs are timed with the vacuum line connected. 5 degrees BTDC on late SCs, 5 degrees ATDC for early SCs. I could be wrong. Mine is set at about 12 degrees BTDC with vacuum line disconnected. That gives me about 35 degrees full advance. Runs much better than stock spec.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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