I'm sure after all the digging and labor someone will chime-in and say, "Oh it's right there." Until then. Most sites I found list it like this, 230-2507. After surfing the internet, I still can't find without 100 certainty which it is. The local parts shop, and speed shop couldn't figure it out. For example, a casting number starting with B8 was manufactured in 1958. Note: the 1933&1934 837231 Heads have the same casting for both years, but a different part number in each year. Head: 836961 DA Passenger, Sedan Delivery, Master, DB 1/2 ton truck, PA PB PC PD 1.5 ton trucks. Note the second number in the casting number. Block: 837231 DA Passenger, Sedan Delivery, Master, DB 1/2 ton truck, PA PB PC PD 1.5 ton trucks. It's a letter to designate the year of manufacture of the part. Still can't believe it's so difficult to identify it. I pick-up a super clean '67 Chevy G-10 Van a few weeks back. Note the first letter in the casting number. I'm replacing the rear main seal and oil pan gasket anyway, so when I'm there I'll rotate the crank and get the number to find my answer. It's a running joke with my idiot posse ) Gotta laugh! So, without finding an external casing number somewhere on the block, the only way to know, is to get the forging number off the crank. I'll update this thread with that info after I pull the trany to rebuild it. The magic number could be hidden behind the bell housing. Seems there is no external way to positively identify the difference between a 230 and 250. The 230 and 250 both have the same bore of 3.875", which by-the-way can be opened up to 4" to accept 350 pistons, but thats another story to be ventured into. The answer didn't jump off the manual's pages, but did point us in the right direction. I went a local machine shop today and dug up some juicy info. Seems we are not alone in the search for this answer.
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