Block casting number search

Garrett Ellison said

I remember when that block was available, but don’t remember much else about it. With only .030 between the outside of the cylinders, I would be really surprised if it couldn’t take a 4-1/8 inch bore. But I’m right there with you on sonic checking it first, though!

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What year did they release this version? I'm racking my brain to think of why I've never seen this before. Trying to remember the years I went to PRI (was going to go this year but that got gut shot) and even there, I don't remember a block with an R3 on it with the LA/wet sump lifter valley in it. Could be I've seen it and didn't pay attention. I hope not.