If that crack would cause the seat to fall out, then why aren't people having problems wit hthe heads?
Seriously, just about all of them do it. I don't believe it will be a problem, but if your worried about it, have them fixed.
Both of my heads are the same and they ran ok before pulling the head off. WHen I say ok, I mean no problems with the seat or head itself.

 

The cracks between the valves are common. You will be hard pressed to find a head with out them. I would not, and do not myself, worry about them.

 

Those cracks are as common as you and I breathing air. Have it pressure tested and probably resurfaced and put it back on.

 

I got a perfect TBI G head that I converted, TBI's don't see as much heat therefore not as much thermal expansion happens....less likely to crack. This doesn't work much for swirl heads though as Gary D says that TBI swirl heads don't have the Tapered Shroud. He says in some cases it increases knock sensitivity. I don't know what the tapered shroud means and I don't care since I run G heads.
I had a seat fall out on a head that wasn't cracked, unless the crack is seriously split open than the head is still useable. I've seen cracks with as much as 1/8'' between them (maybe more, I didn't measure accurately) but at this point it may have been leaking antifreeze into the cylinder.

 

My brand new head from FM cracked within 2000 miles of beatings. Its normal. They ALWAYS do that. Its VERY rare a TD drops a valve seat. Just run the head and dont worry about it. Trust me, and all the others that say the same.

When I brought my head to a local engine shop to get re-surfaced the guy said "this head is junk" I laughed and told him the head had almost $1500 into it and it was on a motor that just made 340WHP. He still said it was "all done" I told him to shut his mouth and I found a new guy to do my work, and this guy is actually very interested in my cars ability to perform.

 

the craks are common and they dont hurt unless they are deep in the head. bu it should be fine my sundance had those and my brother (who runs the napa machen shop) said thats common lol

 

Even though he doesnt know anything about turbo engines

That's the key sentence in your post.

If I don't see the cracks nowadays I get worried that something is wrong! I've seen the business end of about 8 TD cylinder heads to date.

Somewhere on here you can find a link to a technical service bulletin from Ma' Mopar saying they are a-ok. Leave the crack repairs for the 16v guys.

 

Small cracks are acceptable there. You can tap around them with a ball peen hammer if you want to close them up or find a TBI head which don't generally have cracks like that.

Chris-TU

 

thanks for the help TD guys. i appreciate the help and now that i know, im going to get it pressure tested and resurfaced and go ahead with the fun stuff.
thanks

 

My brand new head from FM cracked within 2000 miles of beatings. Its normal. They ALWAYS do that. Its VERY rare a TD drops a valve seat. Just run the head and dont worry about it. Trust me, and all the others that say the same.

When I brought my head to a local engine shop to get re-surfaced the guy said "this head is junk" I laughed and told him the head had almost $1500 into it and it was on a motor that just made 340WHP. He still said it was "all done" I told him to shut his mouth and I found a new guy to do my work, and this guy is actually very interested in my cars ability to perform.

the guy at the junk yard told me when i bought my first 2.2 turbo head told my "if it ain't cracked it ain't good" I have bought a lot of heads off him for me and for other people and i have never got one that caused any problems from the stress cracks. put it back on boost some more enjoy!!!