Double Hump Heads can't identify???

Hi Guys,

I have a set of double hump heads on what we believe is a '64 327. The casting numbers on them are 8782481 and 114H. Then they say "GM" with a "4" underneath it. I can't seem to find any info on this number. Anyone here know about it? I looked really closely and don't think it says "461". Really looks like "481". Thanks for any help!

EDIT! I was wrong. As soon as I hit it with degreaser could see it is "3782461" SORRY GUYS

 

its probably "461"heads. had heads before that the 6 almost look like an 8

 

is their a place for a temp gauge?

 

If my book is right they are 64-66 327 heads.

 

look at the numbers again. are you sure they are not 3782461. that is a dubble hump(camel hump) head 61-70 64 cc chambers. they came with 1.94 or 2.02 valves. the 461's are the better of the "dubble humps" in my opinion.