[ChiefPonch]

So......

I just bought another 65 fullsize today (I'm officially an addict....as if I needed any confirmation of that fact). It's a Star Chief 4 door auto with a "YD" code 290 horse econo-389 2 bbl. with A/C and an automatic. I am NOT a fan of 4 doors in general, but the drivetrain was pretty much worth what I paid for the whole car. Plus I have a soft spot for ANY 65-66 fullsize & sometimes I just can't resist. I've played around quite a bit with '60's & 70's Pontiacs and specifically these 65 & 66 fullsize 389's. I'm nowhere near the friggin' geniuses I've run across on this forum, but I like to think I know way around a Pontiac engine. Anyway, I've never had any problem identifying heads (usually 092's or 093's in the 65-66 big cars). This one, however, has NO CODE on the middle 2 exhaust ports. They do have the normal "GM" cast into the front exhaust port and a couple characters cast into the rear as well (see pics). I was told the engine had less than 1000 miles on a rebuild and that new guides & seats were done on the heads at that time. I believe that story given all the new exterior parts of the engine and how well it runs, but no receipts were included. So.....pardon my ignorance if this is something I should already know given my experience, but what the hell do I have here? Can anyone ID these heads & maybe help me out with some specs? Once again, I can't thank you enough (in advance) for your help. Here are the pics......