Got a member over on ChevyTalk that is having problems ID'ing the SBC heads in his 56 Chevy 210.
Numbers make no sense & I have ran them & come up w/NOTHING.

Here's his post plus some pics of the heads....

I have a 56 Chevy, 210, the engine has 4bbl heads, but I can't find the head casting numbers listed in any reference material. I've been told they may be 59-60 truck heads, and possibly Canadian in origin. There is a vertical block on top of the rectangle, on the end of the heads, but the sides of the rectangle are sloped rather than vertical. The casting number on the heads is: 3773013. If anyone in this forum can shed some light on this particular casting number, and maybe with some reference, it would be appreciated.
Sooooooooo folks what the hell does he have or is it possibly he has a set of head w/BS casting numbers.
He says that the 3's are 3's & not 8's