Originally Posted by A.R
Soundbiscuit,

If you're interested in buying a new Zenith carb, you can purchase this brand new straight from Zenith Fuel Systems. It's not cheap, but it will do if you're really looking for a new one. And it comes factory adjusted as well.

This is their new website. It used to be called Autotestsys.com, but all of their items are now on here. The Zenith carb for your 1955 GMC 248 is part number 14275. I have a 1955 2nd Series 248 and this is the exact carb. Their new site does not have all the pictures for their carbs yet. Their old site had the pictures for all of their Zenith carbs.

http://norfar.com/collections/carburetors/products/zenith-14275-carburetor



A.R.

The Zenith 14275 is a great carburetor, and it is the suggested aftermarket REPLACEMENT for the G.M.C. 248. And yes, it DOES come factory adjusted TO ZENITH STANDARD SPECIFICATIONS NOT TO THE SPECIFIC NEEDS OF A 248.

With no offense meant to anyone, the 14275 would be more difficult to adjust to the 248 than the original carb which had been rebuilt twice, which was specifically calibrated for use on the 248.

For the record, we are a distributor for Zenith and stock the 14275 carburetor, so I could have offered it to the OP earlier in this thread. However, I personally dislike selling something that is NOT going to fix the problem just to sell something.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop