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

 

Hello, and welcome.

Your Motorcraft 2150 came in two sizes: 1.08 venturi, 287 cfm, '73 - '83 302W. (You sure the 1.08 isn't an Autolite?)
The other, 1.21 venturi, 351 cfm were for the 335 series engines.

Jets for the 1.08 - 48F, 49F, 50F. Power valve for both I think was a 5.

Jets for the 1.21 obviously will be bigger: 53 - 60. I think 56 was stock for this one.

Your vehicle came stock with the 302, 2150 Motorcraft, 1.08 venturi and I don't know what stock jet size is/was.

Clean/rebuild 'er up and fiddle with the jet size 'till your engine likes it.

http://www.carburetion.com/ford2v.htm

 

If this is a double reply, my apologies, I am still learning how to use a forum.. Thought I replied, don't see the post.

I had the 1.21 venture on the truck, ran rich was very difficult to tune. This explains why.

"You sure the 1.08 isn't an Autolite?"

Wouldn't know how to tell the difference between a Motorcraft and an Autolite, but the 1.08 and 1.21 embossing in the castings are in the same location and all of the parts are 100% interchangeable. In fact I had taken the brass venture assembly out of the 1.08 and used it in the 1.21 before I discovered the differences. (the aluminum one in the 1.21 wasn't very pretty and had some pitting)

Thanks for redirecting me to the right carburetor body before I invested any more time in and effort with an oversized carburetor.

Best Regards,

Wally

 

You're welcome...next time try the search function at the top of the page.....if you did already and got nowhere, well, we're all here to help.