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Trying to decode serial number on my 235
F2 55 x
F is flint
2 maybe February
55 is year
What is x?
Ultimately what I need to know is if this was attached to power glide to get appropriate pilot bushing
Thanks again guys

X* 31-32-36-3800 Thriftmaster "235"

maybe depending on year

you can dig deep here

https://chevy.oldcarmanualproject.com/models/engine.htm

Probably a 55.5 year model engine since the X code at end is in the 1956 years as well.

Decoding chart below taken from the GM Heritage Site 1955 Chevrolet Truck 2nd Series PDF.

The "2" in front of the "55" designates it as a 1955 2nd Series engine. The date casting code, located above/behind the starter on the side of the block, will tell the Month (alpha character), day of the month (1 or 2 numerals), followed by the year (one numeral) it was cast.

The "X" confirms it was originally installed in a 1/2 ton (31 Short bed or 32 Long bed) truck. No powerglides used in those trucks, so a standard pilot bushing is what's needed.

Perfect. Thank you