F=Flint;
1202=engine build date=December 2;
The B suffix was used on '57-'62 235 car engines with powerglide. It was also used on the '63 and '64 full-size car 230 with powerglide. You'll have to find the block date code to pinpoint the year.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"