ZL-1 heads w/o exhaust heat crossover passages ?

[Rock Crusher]

I am new to this site and seek your expert opinions...

I have a set of ZL-1 heads # 3946074. The casting dates are 2.18.69 and 4.21.69. These heads appear to have been cast without exhaust heat crossover passages. They are the only #3946074 heads that I have seen without them, although I read an article on the Camaro Research Group site that says that ZL-1 heads do not have this passage. www.camaros.org/copo.shtml

The heads have several logos, letters and numbers stamped on the ends- Batten Heads, Romulas, Michigan (stylized logo) Diamond Elkins (std individually hand stamped letters) E 892 R is stamped on one head and E 892 is on the other (I assume that R signifies right side) They also have 71201 and H.C. stamped on both heads. I read some where that H.C. was stamped by the factory and signifies high compression ? I can post photos of these features if needed.

They have been decked and ported. I know about C.J. Batten and Butch Elkins and their extensive port and flow research with ZL-1 heads. Unfortunately, both appear to be out of the business, so I can't ask them personally. I would like to find out more about these heads and determine if they have any historical racing provenance. If anyone knows how or where I can find out that sort of info, I would greatly appreciate it.

Thanks in advance.

[Rock Crusher]

Sorry Guys- Looks like I have to eat some crow...
I planned on taking a few shots of these heads to post here, so I cleaned a decade or two's worth of dust and grime off of the heads and discovered that the crossover passages had been filled with some type of material such as Devcon and then sealed with aluminum paint. Carb cleaner did the trick. So now I must apologise for my misleading claim that the passages didn't exist. I am still curious about the information on the CRG website that states that ZL-1 heads do not have exhaust heat crossover passages though. Is that correct or not ??? I attached a link to the CRG/COPO page in my previous posting if you would like to see it.

I would still like to determine the history of these heads though. I will attach a few shots to show the markings. The Batten Heads logo was stamped so light that it is difficult to see in the photos. It was just about impossible to even do a rub. If you look real close you can see the logo above the #71201 in one photo. I have to get the angle just right to get that much.

[Rock Crusher]

I'm looking quite foolish right now...

I'm not much of a nano-geek. I took these pics with a 8mp camera... I've had to edit/downsize these pics several times in order for them to download. Now it seems that I can only get one pic attached to this post and it's so damn small you can't see much detail. I'll throw in the towel at this point.

Thanks again guys, Sorry to be so bothersome.

Rick