Guys

We had some really nice weather here today so I pulled both Carter YF carbs off the 235. What I found was that the forward carb was forged with A 788 on the base section (throttle plate area), and the aft carb was forged with C 788. I don't know what the differences are between these two throttle sections but, there has to be something significant.

I pulled a spare Carter YF off the shelf and swapped the base section on the aft carb for the one on the spare. The truck now runs quite well, idles as it should, and the hesitation, sputtering, popping, and backfires and now mostly resolved. I do get some small amount of pop and sputter but only on hard acceleration. Something I do not do as a habit.

If anyone has any insight concerning the differences between the A 788 and the C 788 base section, I'd be interested in your thoughts on this.

Thanks to all who took their time to help me work through this problem. If I do decide to upgrade the fuel system at some point, I'll post that update on this thread. Best Regards,

Tom

Last edited by Ghost_Rider; 03/26/2023 8:46 PM.
Ghost Rider
Little Egg Harbor, NJ
1942 Chevy 3/4 ton pickup, 1962 235, Offy intake, Fenton headers, Dual Carter YFs, 1984 T5
1956 Chevy 3100 Apache, 67 350SBC, Saginaw 4 speed, 69 12 bolt