[TerryR]

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?

 

[67drake]

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.

 

[TerryR]

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.

 

[n2omike]

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!

 

[pkevins]

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.

Block

A source database for the mustang hobbyist. Find detail information for your Mustang and Shelby Fan Clutch. FE 352 390 406 410 427 428CJ, Small block 289 302 351, 385 series 429 460 block casting decode

mustangtek.com

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

 

[chrlsful]

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?