F22a SOHC (single overhead cam), 135 hp @5299 rpm I believe.
Congrats on the purchase! Do lots of browsing through all the Prelude forums and learn as much as you can about your car. Here is a useful link to an explanation of the generations:
http://absoluteprelude.com/forums/in...CODE=01&HID=18
Here is what it means to be an S:
http://absoluteprelude.com/forums/in...CODE=01&HID=25
-Dan