Replacement Carburator/ Intake Manifolds for 1976 Mercruiser Ford 225hp 302's

Russfest

Recruit
Joined
Jul 24, 2011
Messages
1
Hello,

Looking for suggestions for good replacement carburators and cfm size for my engines. Also a good intake as well if Im going to change the carburators.

I have twin 1976 225hp Mercruiser Ford 302's going through opposed rotating TR-2 I/O Legs. Port Serial Number is 378064, and Stbd Serial Number is 3780189.

The legs were gone through by mercruiser around 7 years ago, and the engines were rebuilt after one of them being cooked around the same time. Then sat for years.. Then I bought it. Thus me needing to change my seized and severely corroded holley's.

Ive looked through summit, and it suggests a Marine Model 4160 450 cfm one, only its for a 1985-2001 windsor. 450 cfm also seems a bit small to me.
http://www.summitracing.com/parts/HLY-0-80364/
As for the intake manifold, with the stock manifold and current Carbs it came from the factory with, I cant go much higher. I've only got about 1.5 - 2 inches of clearance from my spark arrestors till I hit my engine hatch.

Thanks for any help or suggestions,

Russ
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,464
Re: Replacement Carburator/ Intake Manifolds for 1976 Mercruiser Ford 225hp 302's

Ayuh,.... If yer boatin' in Saltwater, stick with a cast iron intake....

I'd think a carb of 550/ 650 cfm is what ya need for 4bbl. carbs...
450 cfm sounds like a 2bbl...
 
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