Clearing the air here....I am a novice forum subscriber. So, let's see where this goes....Please bear with me as I want to be very clear with what I have and hope to get a clear path to where I need to go to resolve my air/fuel issues.

Question: What is the correct carburetor / jet combination for this vehicle???

Vehicle:
1977, Ford F-100, Explorer, long bed, 302 cu. in., w/ AC, automatic transmission, low miles, no rust. Allegedly, "all original". To my knowledge, I am the third owner. The previous owner supplied all spare parts including a second carburetor he considered the original.

History:
Carb installed at time of acquiring truck: 2150? 1.08 venturi, .049 jets.

Alleged "Original" Carb: 2150, 1.21 venturi, .057 jets.

The vehicle never seemed to idle right so I partially rebuilt and installed the 2150, 1.21 venturi w/ .057 jets.

I did not pull the venturi cluster assembly and it later started to geyser fuel out of the carb. So complete tear down this time. Dipped in Berryman's. Found most of the passages clogged with sour fuel deposits and the venturi cluster assembly was stuck in the carb body due to crystallized deposits. Yep, it was a b!+c# to get out.

After complete teardown and dipping, the 2150, 1.21 venturi cluster assembly appeared to be mostly constructed of aluminum and indicated evidence of pitting along all of the aluminum surfaces.

The 2150 1.08 venturi cluster assembly appears to be brass and in very good condition.

Proposed Solution:
Use the 2150, 1.08 venturi cluster in the 2150, 1.21 venturi and determine the correct jet size for this application.

When I shopped the mainstream parts houses, they came up with a 2150 but did not include any more detail.

Assistance with determining the correct carburetor/venturi size/jet size is greatly appreciated.

Thanks for any assistance that is provided....

Wally

 

So, I have the 1977 Ford Factory Manual. Nothing about carburetor specification. I've exhaustively searched the internet and continued to find conflicting information. I stumbled upon this forum which appeared to have some threads inquiring into similar carburetion sizing and jetting questions. Surely someone can point me in the right direction. Thanks.