A friend wants to know about a particular small block.....casting number is 24681307. Any idea what this block is?

request that he look at the numbers on the other side

that number seems to be off a 383

Its a 383. Need more numbers. Look at the area on top where bellhousing meets engine near oil sending unit for a number. Look for a date on the side of the block. Look for a number on a flat pad right above the oil pan. And several numbers right under the distributor on a flat pad. Those numbers will help ID year. Looks like around a 66 or 67 year or possibly a 68. See what you can find and repost.

The Engine ID pad up on the block by the cylinder head would be where I'd start first. It tells how the engine was built. It should have stamped into it something like
C383Pxxxx.
Other marks scattered around that pad will tell you any factory oddities, like one rod bearing is undersize, or one lifter bore is oversized, etc.

Next in importance would be the casting date, cast into the side of the block.

Third (for me) would be a number stamped into the machined pad just above the oil pan. But depending on the year, it may either not be stamped or not be there.

R.

The casting number is 2468130. The dash number, in this case 7, has something to do with how many times the casting core was repaired, IIRC. In reality it means nothing.