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lift at tdc is one indication of duration (overlap) https://www.micra.org.uk/threads/773-cams-duration-and-lifts.39544/

the stock cams are listed at 222deg 42-0-0-42 , the 0-0 suggests that that there would be no overlap at tdc but all the stock cams i measured had all 4 valves slightly open at tdc, so the stock 222deg is a very conservative figure


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