OHV Engine Casting Numbers

Do not take this information as gospel.  This is a collection of engine casting numbers from tractors at various shows.  I am attempting to establish a method for determining engine size and sleeve vs non-sleeve by casting number.

Roger Clark provided the following additional information (If my notes are correct) :

• Casting Numbers beginning with "EAE" are 134 CID

• Casting Numbers beginning with "EAF" are 172 CID

• Casting Numbers beginning with EAE and EAF are 1955-1957

• Casting Numbers beginning with  B9NN are 1958-1959

• Casting Numbers beginning with CONN are 1960-1964

• B9NN6015A is definitely a 144 CID  Block with Sleeves

• B9NN6015B is definitely a 172 Block with Sleeves

• CONN6015H is definitely a 144 CID Sleeveless Block

• CONN6015J is definitely a 172 CID Sleeveless Block

• 310609 id definitely a 172 CID Block

I  have come to the conclusion that a 172 block can be either gas or Diesel, 134 is gas only, and that 144 is Diesel only.

Carl Davis provided the following information:

• Casting Numbers beginning with "EAE" are 1953-1957

• Casting Numbers beginning with "EAF" are 1955-1957

• Casting Numbers beginning with "B" are 50's (ie. "B9" is 1959)

• Casting Numbers beginning with "CO" are decade of 60's

• "NN" in casting number means tractor Division.

• "6" means section of parts book.
   

My conclusions: (Under Development)

• Casting Numbers beginning with "EAE:
  - 1953-1957
  - 134 CID block with Sleeves and Canister oil filter
  - Suspect the letter  after 6015 is the year made D=53. F=54, H=55, J=56 and 57

• Casting Numbers beginning with "EAF:
  - 1955-1957
  - 172 CID block with Sleeves and Canister oil filter
  - Suspect the letter  after 6015 is the year made H=55, J=56 and 57

• Casting Numbers beginning with "B" are Decade of the 50's
  - Second digit may be the year.
  - NN is tractor Division
  - 6015 is part number (6 is section of parts book)
  - Last letter "A" is a 144 CID block with Sleeves and Canister oil filter
  - Last letter "B" is a 172 CID block with Sleeves and Canister oil filter
  - Leaves the question what letter is the 134 Block

• 310609 is a 172 CID block with Sleeves and Canister oil filter (Year Unknown)

• 310905 is a 134 CID block with Sleeves and Canister oil filter (Year Unknown)

• Casting Numbers beginning with "C" are Decade of the 60's
  - Second digit may be the year.
  - NN is tractor Division
  - 6015 is part number (6 is section of parts book)
  - Last letter "C" 172 CID block with Sleeves and Canister oil filter
  - Last letter "G" 134 CID sleeveless Block with Spin-on Fliter
  - Last letter "H" (Not Sure)
  - Last letter "J" 172 CID sleeveless Block with Spin-on Fliter