There is a bit of info on the site below and they seem to think the blocks,pistons and rods are different.
http://home.att.net/~jason510/Motorspecs.htm

David Costello wrote:

ahhhhhhhhhthanks for that, someone told me the S meant Siamesed Blocks, and that there was some difference between the 2, I must have been miss informed, thanks Mal
----- Original Message -----
From: maldat
Sent: Tuesday, September 24, 2002 4:47 PM
Subject: Re: block identification
 E=EFIS=single carb the engines are the same Malcolm
----- Original Message -----
Sent: Tuesday, September 24, 2002 4:43 PM
Subject: block identification
 are there any markings on a Z20 block to look for to tell whether you have a Z20E or Z20S block? is either stronger than the other? how far can you safely bore a Z20 block that will be running boost? Dave


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