Is this a C113 or a C123 Engine?

Kevin in Va

New User
Working on a 1952 Farmall Super A, FAA SN 327054. The block has 3" bore sleeves and flat top pistons in it Casting number is 354898 R1. Casting date is 2-6-X, so it was cast February 6th 1954 from what I was able to gather. The serial number on the block is 328671 with an FAA with something that could either be an IV or a M. FAAIV or FAAM? There is also a "G" to the upper right of the serial number. There's no C-123 identifier cast into the block like some photos I've seen. The isn't any dipstick either. Just wondering as I'm getting ready to order a rebuild kit and would like to go to 3-1/4" with stepped pistons if possible. Thanks in advance.
 
Pull a sleeve and take a measurement at the bottom where the o-ring goes that measurement will tell if the 3 1/4 will fit without machine work.
 
factory C123 has 3 &1/8 bore. 3 inch bore is standard C113 bore. I will check that casting number tomorrow.
 
Measured the sleeve. It"s 6.78 " in height and 3.11 inches at the lower area. Found a document on Advantage Engineering site. There"s no water pump on mine. The serial number on my tractor 327054 is higher that any of the kits for the C113 on the store site but falls in the range of the C123 engines. My best guess is that it might be an early C123 as the the casting model number is 354898 R1. All the part sites just have them as 354898 R2. Also, there look like a spot on the block where the dip stick would go but was not yet implemented.
IH C113 and C123 Engine Sleeves
 
if it measures 3.11 it will not take the 3 1/4 sleeve without boring the bottom where the o-rings are located. You only need to remove 60 thous giving it a bore of 3 7/16 instead of what is now 3 5/16
 
IIRC: At some point in Super A production, IH started boring their C113 blocks to accept C123 sleeves, and used a thick sleeve to bring the displacement down to 113 cubes. So, what you have is not unusual.
 

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