I have been using downloaded copies of the casting numbers for years to see what numbers fit in what however on the far right there are “”COMMENTS”” that I could never figure out the meaning of . Most are self explanatory , however some re lost to me and I finally signed up to hopefully find their meanings . Today I looked up a 327 with casting # 3858174 and comments are FULL , A & Y could someone help me out here ? I also see F …X…..??