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Topics - Rock Crusher

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Originality / ZL-1 heads- castings w/o heat crossover passages
« on: March 22, 2009, 09:34:21 PM »
I have a set of 3946074 aluminum heads that I purchased from a guy in Michigan. They appear to have been in storage/unused for quite some time. He purchased them at auction and knows nothing of their history.

I read on the CRG- COPO page that ZL-1 heads did not have heat crossover ports. www.camaros.org/copo.shtml

The heads that I have do not have any heat crossover ports. The castings appear to be that way from the factory. Both heads have 1969 casting dates. The heads have been decked and have had port work done. They both have the stampings; Batten Heads, Romulas, Michigan (stylized company logo) and Diamond Elkins (std individual hand stamped letters). There are also some various letters and numbers stamped on them as well  (E 892 R is on one head and E 892 on the other, 71201 and H.C. is on both heads, I wonder if any of these could be serial numbers ?).  I read an article somewhere that described the H.C. markings as factory stamped signifying high compression.

All of the other 3946074 heads that I have seen appear to have functional heat crossover ports. Until I read the COPO/ZL-1 article describing ZL-1 heads on the CRG site, the missing ports had been a mystery to me.

I did a bit of research and found that C.J. Batten of Batten Heads and Butch Elkins of Diamond Racing are both renowned port and flow wizards. Unfortunately both are out of business now.

I would like to know if these heads have any historical racing provenence. If anyone has any information I would appreciate it. I can post some photos if neccessary.

Thanks in advance

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