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Old 02-03-2019, 07:39 PM   #1
Acgreen3256
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Default 4 barrel or 2 barrel carb?

Ive got a 77 scout II traveler with the 5.6L V8 2 barrel factory carb, wondering if i should get a 4 barrel carb. what are the pros/cons of more barrels, how will my engine handle a 4 barrel carb, and if i do decide to go for 4 barrels what brand/model of a 4 barrel carb should i get?
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Old 02-04-2019, 08:27 AM   #2
Scoutboy74
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Default Re: 4 barrel or 2 barrel carb?

A good 2bbl carb is all that engine needs. Aftermarket Holley 2bbls in the 350cfm rating work well on these engines right out of the box. Avoid the 500cfm rating, however. To do a proper 4bbl conversion, you also need a matching 4bbl intake manifold. Further, there are both spreadbore and squarebore versions of 4bbl intake manifolds for the 345 and 392. Same with the 4bbl carbs. Squarebore means all four holes are the same size. Spread has small primary holes and much larger secondary holes. Its not a one size fits all scenario, so definitely not something to do in willy-nilly fashion. Using an adapter to make a 4bbl carb fit a 2bbl manifold is totally pointless. You don't get the use of the secondaries with that adapted setup, which defeats the purpose of having a 4bbl carb in the first place.
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Old 02-04-2019, 01:30 PM   #3
1975IH200
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Default Re: 4 barrel or 2 barrel carb?

Holley List 0-80350 for a 350 CFM carb with electric choke.

Holley List 0-7448 for a 350 CFM carb with a manual choke (cable operated choke).

Don't bother with a 4-barrel carb for your SV-345......unless you get a good Carter ThermoQuad carb and spread-bore intake manifold and know what you are doing.
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Old 02-05-2019, 07:22 PM   #4
Acgreen3256
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Default Re: 4 barrel or 2 barrel carb?

Thank you for the input
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