55GMC - you have the numbers reversed. The 11148 is for a 248. The 11965 is for a 270 and is the larger carburetor. The 11965 flows approximately 6 percent more than the 11148.

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