Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 191Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 191

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SERVICE MANUAL NUMBER 24
Following procedure is performed with engine operating: 1 Check engine for normal operating temperature2 Remove rocker arm covers and install rocker stoppers as shown