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Discussion Starter #1
Can you tell me what engine I have?

Casting number is:
C40E-6015B
3H5
Also my son saw a cast number on the passenger side while rebuilding the clutch equalizer bar. He didn't say if it was on the engine or the heads?

My question is:
is this a 289 engine or a 260 engine as I see they carry the same casting numbers? I was told it it was a 289 hi po upgraded engine?
 

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I had a heck of a time decoding my ‘62 260. I still thought it was a 221 until I pulled it and was measuring the cylinders! Not as easy as some other manufacturers that’s for sure.
Maybe these pics will help. Process of elimination if anything.
56AF4A04-4D56-4F31-8DA3-45B0E560E6B9.jpeg
FC294632-C5A5-459E-A691-0B6CF0C74773.jpeg
7043BBED-08C3-490A-8BC5-8723F6102581.jpeg
56AF4A04-4D56-4F31-8DA3-45B0E560E6B9.jpeg
 

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Discussion Starter #3
Thanks Drake. it is confusing. I know it is a 5 bolt and I didn't want to take it apart to determine what it is. Since it was modified I'm guessing it could be a mix of anything from a 260 to a 289? I was hoping the block casting would somehow tell me. Nice ride BTW. Mine is in a 64 Ranchero.
 

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A 5 bolt 289 block is nice to have, as it has the same 4" bore as a 302, and allows anyone with a 221-260 to build their engine as a 289/302/331/347... and have it still look original. Therefore, there is some demand for good 5-bolt 289 blocks. If that's what you have, don't junk it.

Good Luck!
 

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Can you tell me what engine I have?

Casting number is:
C40E-6015B
3H5
Also my son saw a cast number on the passenger side while rebuilding the clutch equalizer bar. He didn't say if it was on the engine or the heads?

My question is:
is this a 289 engine or a 260 engine as I see they carry the same casting numbers? I was told it it was a 289 hi po upgraded engine?
Maybe, C4OE-6015-B
Letter O in the prefix.
Only way to know the displacement for sure is to measure the bore.
Many sites out there on 289 Hi-po. No difference in the short block; it's all about the valve train, main caps etc. Much of the content here is credible: Forum - The HiPo Mustang eKschange
 

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what bout a measurement thru the spark plug hole at BDC. The piston is at its lowest point, a straw or stiff wire thru the hole, moved a bit till at furthest reach? We do it w/a Harley 883 or 1200? But we have known distances. Nuttin like that 4 U folks?
 
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