NOS327

iTrader: (30)

This block has been passed around Wichita and now I have it, previous owner tried to decode it here, with no luck. It's a little dinged up, but bores measure OK. The casting number doesn't come up anywhere, 12610679AA. Looks like any other gen IV iron block except it has skirt oilers like an LSA/LS9 (and the font is different on all the cast numbers). They don't really look like the katech squirters. Does GM have some ultra heavy duty iron block application that used them? Or is it possible that the first attempts at LSA/LS9 were in iron blocks? Prototype fodder?? (there are 3 other sets of numbers hand scribed on this block). I have a set of early LS9 heads that are an odd casting number and end with AA also, coincidence??

Anyway, I'm planning a 4" stroke build and google search says the OE oilers won't clear extra stroke stuff, so this dude is getting replaced. Just curious if anyone has some knowledge about iron block 6.0L with skirt oilers so I can speak more intelligently when I go to sell this one.







Here are the LSA version of the oilers. Picture is huge, so I'll just post the link here.

And here are the hand etched numbers I talked about




This one is almost the casting number.. 12610677AC


Any insight, please feel free to share.
TJ

KCS

iTrader: (20)

I've seen one of these a few years ago. Never did find out what it went to. I built a 408 out of it, and removed the oilers and just used set screws with thread sealer.

LS3RX7

iTrader: (9)

That is a prototype block that never made it to production. Should be fine to use.