2 to 4 barrel? 74 f250 390 fe

Asked by Flat_hauler2 Jun 10, 2019 at 02:40 AM about the 1974 Ford F-250

Question type: Maintenance & Repair

I have a 74 f250 with 390 2 barrel holly I wanna upgrade to a 4 barrel and mild
performance intake with out jeopardising   much on mileage  what do you
recommend ?

2 Answers


If you drive easy, a four barrel carburetor will bet better fuel economy than a two. I think it's a good idea, but you'll also have to replace or modify the air cleaner to fit the larger orifice. Linkage modification shouldn't be difficult..... I'm glad it's a "74 and not a "76 that would get into smog test problems.

1 people found this helpful.

Use a small 4 barrel not too much bigger than the 2 barrel. Summit racing has a 450 CFM carb with vacuum secondaries that they sell as an economy carb. I would try the carb first before you upgrade the cam.

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