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S A or SC?

T

TWheat

Member
I bought a SA with engine parts in card board boxes. I could not figure out why the sleeves and pistons were 1/8" larger than specs. AHA, Super C sleeves and pistons?? Now the question is, what block and head do I have? Block P# is 251069 R1, block S# is FAAM 258102 with a G up in the right hand corner (does not match sn tag under seat FAA255740) Head P# is 251172 R1.
Maybe a SA block with 123 sleeves? What about the head? Thanks for any help.
 
Thanks Dave, That is most likely it. I was just thrown by the 3 1/8 " sleeves and stepped up pistons
 
T Wheat: That engine serial number compared to tractor serial number is about correct. When Super A production started a spread started to develop between the two, by 1951 nothing for the numbers to be off by 2,000-3,000. The head is correct. You've got an original tractor with 3-1/8" sleeves.

Block part number 251069 R1 was the factory block used in Farmall C and Farmall SA up to serial number 310300. They could all be fitted with 3" or 3-1/8" pistons. From the factory only 3" were used. In 1951 the block changed to number 354898 R1 and used in balance of SA all SC. It could be fitted with 3", 3-1/8" or 3-1/4" pistons. 3" was used in SA until serial number 356001, then SA changed to 3-1/8" bore. SC was always 3-1/8" from factory.
 
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