Quote Buoymaker "Mercruiser dual 1 barrel Rochester (7025183 BC and 7025184 B). These were used on mid 60's I6 engines. The following year ~ 1965, Mercruiser changed to the small bore Rochester 2GC. I don't know the reason for it but I can make a guess." End Quote

Would you REALLY want a leaky Rochester B on YOUR boat??? wink Have to run the bilge pumps all the time, even when the boat was in dock! wink

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop