Scott,

The Engine serial number you displayed above, ending in "F54U" indicates this is a 1954 Thriftmaster 235 installed in a 3100 1/2T truck at the Flint manufacturing plant according to the info found 1954 Chevrolet Truck Info Kit available at the GM Heritage web site.

What engine date info did you see to indicate this may have been manufactured in '55?

Dan
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Engine Serial Number data 1954-Chevrolet-Truck.pdf.png (109.04 KB, 234 downloads)
1954 Engine data

~ Dan
1951 Chevy 3 window 3100
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