<VV> Question concerning head casting number

[Jim Simpson]

I just acquired a pair of early heads, casting number 3786592.  I 
checked the CORSA tech guide ('96 supplement) and they aren't 
listed.  Closest is 3786591.  These heads have the same chamber 
design as the other early 8:1 compression heads (the "AA" design in 
the tech guide) so I assume they're just a later run of the '61-'62 
heads.  But if anyone can confirm the year and application I'd appreciate it.

Thanks in advance.

Jim Simpson
Group Corvair