1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 444Get this manual
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COLLECTORS
1-14 Inch Muffler Riser InstallationExhaust ManifoldExhaust ElbowBolt (4 Each Manifold)GasketRiser 1-14 Inch (32 mm)
90-840500 MARCH 2000
Page 7C-11