New carb for 302 Mercruiser?

[conk3416]

I currently have the stock carb for my mid 70's 302 Mercruiser motor. Its a 2 barrell holley and i believe it is 300 cfm. I would like to get a carb that is around 500 cfm. Is this a good idea? what would be the best carb to get? 2 brl or 4 brl?

Thanks, Andrew

 

[zbnutcase]

Re: New carb for 302 Mercruiser?

Switch to a 4bbl manifold and use Edelbrock 1409 marine carb.

 

[HT32BSX115]

Re: New carb for 302 Mercruiser?

Howdy,


Is there something wrong with the current carb you have?

Go to Holley Tech Support http://www.holley.com/TechService/Library.asp and have a look at the Carb Numerical Listing

There, you can look up your specific carb for the correct CFM rating etc.

Changing to a larger cfm 4bbl probably won't make a noticeable difference.

If your carb is defective, you can have it rebuilt (if you cannot do it yourself) by sending it to Flyingfish carburetors or other carb rebuild place and they'll either rebuild yours or send you a "reman".


Regards,


Rick

 

[conk3416]

Re: New carb for 302 Mercruiser?

is it ok to put a 4 barrel carb on a 2 barrel intake with an adapter plate?

 

[a70eliminator]

Re: New carb for 302 Mercruiser?

It works but no performance gain and linkages will not fit comfortably being set up higher.

 

[haulnazz15]

Re: New carb for 302 Mercruiser?

Not worth your time to do a 4bbl carb with a 2bbl intake. A dual plane intake will add about as much power as the carb will and allow you to get much better air/fuel mixture.