1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 109Get this manual
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377 CID6.2L ENGINES
aOil Sending Unit Hole 3 Install manifold assembly and torque bolts in sequence as showna1st Pass 27 Lbin(3 Nm) b2nd Pass 106 Lbin(12 Nm) cFinal Pass 132 Lbin(15 Nm)