MerCruiser 85786 85786A1 Flame Spark Arrestor Cover 165hp 4.1L 6yl 140hp 120hp Pulley - Water Pump This is from a 1937

This is from a 1937 Evinrude Sportwin 2

Sterndrive Alpha One I/O

You get the PAIR as pictured

3L was using roller lifters and a specialized camshaft

MerCruiser 85786 85786A1 Flame Spark Arrestor Cover 165hp 4.1L 6yl 140hp 120hp Pulley - Water Pump This is from a 1937Item Details MerCruiser Flame Arrestor Carb Carburetor Cover 85786 85786A1 2 5 8" I. D. Throat on this for Rochester 2bbl carburetors Also Included is the hose & Fitting Part Numbers Included 85786 Flame Arrestor 32 62060 Vent Hose, carburetor to rocker cover 47957 Vent Hose Connector Compatibility Generally Found On MerCruiser GM 165hp 4. 1L 6cyl Models 1979 1981 that were using Rochester carburetors with 2 5 8" opening (But will work on 2. 5L 120hp