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MerCruiser: 12404
I don't even think it was the same as the units used for 1A / 1B / 1C / 1A EZ / 1B EZ / 1C EZ
this is what is called the "Design-I" Flame Arrestor)
This is what to they referred as the "Old Design" exhaust system
MerCruiser 45451A1 45451A2 Propeller Early 1965-69 Thrust Washer 120-160hp MC-1 Transom Clamp Bracket MerCruiser: 12404Part Number(s) Included Mercruiser 45451 45451A2 45451A1 General Application Compatibility This would have been found on some early (1965 1969) MerCruiser Applications EZ Shift IA IB IC 1965 1966 120hp 140hp 160hp 1967 1969 Basically, this accommodates the Flat edge on the propeller shafts so this likely needs to still be used with early style MerCruiser Propellers Other Details Freshwater Used Parts Overall Good Condition! Purchase with confidence!
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