Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 84Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 84

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TROUBLESHOOTING
Few deposits are present and probably will be light tan or gray in colorThis plug shows that plug heat range is compatible with engine, and engine is electrically and mechanicall

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