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I didnt look far enough back on the driver side. Found this casting number. Cant see the right side, too cramped. Sent from my SM-G955U using Tapatalk

Thanks for the help, so it's not a Nav block but it is peculiar it has the dots which I've only see on 6.5 blocks. I ran across a post last week of someone stating blocks like mine were a transition late 90s block kind of thing. I'll try to find it. Sent from my SM-G955U using Tapatalk

Here's the only numbers I can find on the back. The front is marked 6.2. Sent from my SM-G955U using Tapatalk

I'll get additional pics tomorrow. It is stamped 6.2 in the front. I just thought the captains bars and dots in the intake valley was something special. Aren't plain run of the mill blocks void of these features? Sent from my SM-G955U using Tapatalk

The block in my M1009 has the dots in the intake valley like a lot of the GEP produced motors. But it lacks the Navistar diamond in the intake valley. I'm thinking it's a transition block made by GM just before they handed the reigns over to Navisar. Are there any 6.2 nerds here who can...