98 gsr engine code number location

so i am looking to get a new car since the one i drive now is totalled. i found a 98 gsr with low miles and what seems to be a pretty good deal. but i am just a little skeptical. first off the person whos selling it listed it as a "1998 acura integra gs-r SI sport coupe 2dr....i didnt think there was such a thing as "si" with the gsr. but my MAIN question is where do i find the engine code number, i know that it is on the engine block, but if i walked up to this car where would i look to find and identify the correct engine code...thankyou for any help you can offer.http://portland.craigslist.org/clk/cto/2088182670.html
this is the add, take a look and i woud like any advise out there.
 

thenoxus1

Quick-Spool Racing LLC
Looking down on the engine bay, the code will be stamped on the front left..should be b18c1
 
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