i found the cast number it is F 270 922 845 and i need to find a carb if anyone has one for sale can you email me please
[email protected] thanks
The prefix "F" is a factory code that indicates a block/bore spec that is "non standard" (different prefix letters mean different variances from standard). This is common and standard on many GMC 6-cylinder blocks.
There is information on this code at Rob English's oldGMCtrucks.com website. That information (taken from GMC documentation, also shown on Rob's site) states that the "F" code is a suffix. However, it looks like GMC document-writers got "prefix" and suffix" mixed up and the code is actually a prefix code/letter, as you found.
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