LS3 0821 cylinder heads
 

Does anyone know the new part number for these heads? #0821

One of mine is cracked and I don't want to spend the money on two heads right now.

Thank You

Jason, there are several variations of that particular head casting. If you research "LS3" cylinder head, you'll see what I'm talking about. I doubt you'll find another 821 casting, not needing work, but I could be wrong. Hopefully you can. It's difficult to find CORRECT info regarding your particular casting numbers chamber size, port volume, etc. There is a lot of conflicting info out there.
If I were you, I'd buy replacements as a pair to ensure equal chamber size, port volume size, etc. I understand the money side of this, but I know you hate doing things twice as much as the rest of us do. Here's a decent price on the equivalent head that you have. You can actually buy the LSA heads a little cheaper from Summit, but you'd need to compare volumes to ensure your getting what you actually want, and not losing power due to compression ratios, etc.

http://m.summitracing.com/parts/nal-12629063

Can you get a 823 casting as just swap the valves?

I welded it up and it's fixed for now it seems.
Let's hope that works until I change the heads later on