[s-cars] Question about compression ratios and tuning

[QSHIPQ at aol.com]

Bad info mike.  The 3B is 9.3 just like the AAN
In a message dated 2/2/2004 9:23:46 AM Central Standard Time, mlped at qwest.net 
writes:
Has anyone actually measured the combustion chamber volumes for any of these
heads?

What's the source for the information a 3B motor's default compression ratio
is 7.8 to 1?  IMO, a difference of 1.5 vis-à-vis the AAN's 9.3 to 1 is too
large to be accounted for by a head gasket, so that pretty much leaves
either: 

(a) a substantially different piston; or
(b) a larger head chamber.

I doubt (but I don't know for a fact) it's the head chamber, so that would
leave the piston.  

Anyone have a photo of the 3b piston to compare to the AAn or can they
describe the differences? 

Mike