Mercarb or Rochester?

[dtwallace84]

How can I tell if I have a Mercarb or Rochester carb. The engine is 1987mercruiser 3.0 and im replacing the exhaust manifold and im not sure what style manifold I need?

 

[Don S]

Re: Mercarb or Rochester?

The Mercarb has a single mixture screw, while the Rochester has 2.

 

[dtwallace84]

Re: Mercarb or Rochester?

are we talking the idle screw?

 

[Don S]

Re: Mercarb or Rochester?

Idle MIXTURE screw. NOT idle speed adjustment screw.

 

[WAVENBYE2]

Re: Mercarb or Rochester?

This is a Mercarb 2bbl ( one screw) Look at the first pic. closely, very center at the bottom(one screw)