F = Flint Engine Plant
54 = 1954
X = Thriftmaster "235"
A = used in 3600 series

0507735 = engine sequence number (started at 0001001)


'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton

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