1968 carb

[cool68]

i have a question my CS was built feb 15 1968 it has the J code 302 could my CS had come with an autolite 4100 carb or did it come with the autolite 4300 and was replaced at some point ....:smile:

 

[Mosesatm]

Is it possible? With Ford in the late '60s anything was possible.
The 4300 was installed on all '67 small blocks except the Hi-Po, which used the 4100.

I doubt the factory installed a 4100 on your J-code but a dealer may have.

 

[robert campbell]

+1 with Arlie. The 4300 carb was a bit "troublesome" for a lot of owners. Many a 4300 was replaced by the very solid and easy to tune 4100. The 4300 in 1968 was a very new addition to the Ford carb line. And it employed a few new emission control items that the earlier 4100 did not.

But properly tuned a 4300 is a great carb choice for a stock "J" code motor. I prefer a brass float replacement and they are very hard to find these days for the 4300.

Rob

 

[Ruppstang]

I am certain that a 4100 did not come on your car from the factory.
Marty

 

[green56]

Carb

I had problems with my 2100 carb for my 289 when it was rebuilt they put a plastic float in and I kept having flooding problems we just rebuilt carb and found a copper float and that seemed to fix the problem after storage in spring could not get car running gas was just pouring in carb that is why we rebuilt the carb that is when we found out that it we plastic now it starts nice

 

[CougarCJ]

If your 4100 is a 1.08" venturi, I would continue using it. I like those carburetors.
The 1.08 is about 480 cfm.
The 1.12 is about 600 cfm.
I am not sure how many cfm the 1.19, 4100 carburetor flows. I have one.

 

[Mustanger]

If your 4100 is a 1.08" venturi, I would continue using it. I like those carburetors.
The 1.08 is about 480 cfm.
The 1.12 is about 600 cfm.
I am not sure how many cfm the 1.19, 4100 carburetor flows. I have one.

Sounds like you have a rare one:

Autolite 4100
A Ford design that looks similar to a Holley, this carb is a very underrated choice. Coming in sizes useful for a Y, the 4100 uses Holley jets and power valves. The annular discharge booster venturis are very efficient. A great choice for an all-Ford ride, the 4100 is simple and reliable. 3 sizes were made: a 480 cfm unit uses 1.08”venturis, a 600 cfm unit uses 1.12” venturies, and a rare, 1958-only version came with 1.19” venturis for 650 to 670 cfm. Check the carb base for venturi size numbers.
( http://m571.com/yblock/carb.htm )

... :thumb:

 

[TraveledGTCS]

When I purchased my GT/CS new in 68, it had a Autolite/Holley double pumper on it, I had just figured at the factory they just grabbed a carb and put it on. From what I gather from the discussions above, it must have been installed by the dealer. My GT/CS had been on the showroom prior to my purchase. It had been taken out to be washed when I saw and purchased it. It gave good gas mileage and enough performance for me. (It was able to chirp the tires in all three gears and it is an automatic.) Unfortunately it wore out over the years, so now I have Autolite 4300 on it.

Bill

 

[robert campbell]

If your 4100 is a 1.08" venturi, I would continue using it. I like those carburetors.
The 1.08 is about 480 cfm.
The 1.12 is about 600 cfm.
I am not sure how many cfm the 1.19, 4100 carburetor flows. I have one.

I ran into a Pony Carbs rebuild that used a slipped in plastic "chokes" to reduce the venturi size down to a smaller size in the primary. It was very responsive after I went through it again and tuned it to the car. Not sure if any of these are floating around.

Rob

 

[dalorzo_f]

References I have put the 1.19 venturi at 669 cfm (calculated, not bench tested)

 

[CougarCJ]

I ran into a Pony Carbs rebuild that used a slipped in plastic "chokes" to reduce the venturi size down to a smaller size in the primary. It was very responsive after I went through it again and tuned it to the car. Not sure if any of these are floating around.

Rob

That was my carburetor. :grin: You rebuilt it for me. I hope to have it running on my Cougar real soon.

Pony Carburetors called it a 'Spread bore conversion'. They did it on the 1.12's.