4.3 OMC with 4bb carb

[goofdog]

I have a 86 Seasprit 17ft with a 4.3 OMC. The guy I bouhgt it from put a Edelbrock performer manifold and a Holley 4160 carb (600cfm) on it. The carb needs to be rebuilt, so Im not sure how it will run. Is this good or bad? If bad, why? I nave heard that I should have a marine carb. Whats the diff?:

 

[MikDee]

Re: 4.3 OMC with 4bb carb

Hey, Welcome! Unless I'm mistaken, I believe the Holley 4160 IS a marine carb. It's been discussed in many posts here. If you use the search button, you should find some info on it.

 

[danond]

Re: 4.3 OMC with 4bb carb

4160 doesn't explain enough, that typically just means you don't have a secondary metering block.

Have you looked up the actual part number on the carb? I think it's on the air horn somewhere.

FWIW I have a 4160-style 4bbl on my 4.3, it runs awesome. No issues.

 

[goofdog]

Re: 4.3 OMC with 4bb carb

The list # on the carb is 1850-3. From looking on the holley web site I don't think it is a marine carb. Can I still use it? I dont have the funds to buy a new carb. Is there a diff in marine manifolds as to automotive?

 

[180shabah]

Re: 4.3 OMC with 4bb carb

Marine carb is an ABSOLUTE MUST, auto carbs cause explosions!

As for the manifold, the performer is a great choice for marine use, it builds power from idle to 5500, right where you need it. If you have a closed cooling system, or only boat in fresh water then you are good to go. If you are in a saltwater environment, then the aluminum manifold will not last very long.

 

[goofdog]

Re: 4.3 OMC with 4bb carb

Is there any thing I can do to the carb to make it marine worthy? Like putting J style vent tubes. From what I can tell from Holleys web site vent tubes and power valve blow out protection looks to be the diff.

 

[danond]

Re: 4.3 OMC with 4bb carb

Get an actual marine carb and sell this one.

No worrying, no issues with "yeah it's a X carb but I modified it so you need a Y kit" stuff to worry about in the future.

 

[Don S]

Re: 4.3 OMC with 4bb carb

The 4160 is a marine carb, but it's setup for a 460 Ford big block.

http://www.holley.com/0-80318-1.asp

 

[danond]

Re: 4.3 OMC with 4bb carb

Holley released a number of "4160" style carbs over the years. All 4160 means is it's 600cfm and you don't have a secondary metering block. Whether it's marine or not is based on the part number.

 

[Don S]

Re: 4.3 OMC with 4bb carb

Look at your carb, if it has these J tubes, it's marine. if not, it's automotive.