look at this :
http://www.redpepperracing.com/gallery/album20/aao

anybody know what inside this engine?? the specs, setups, performance ,etc???
every information will be very helpfull
i really curiious about N/A D-serries

thanks...

 

it looks nice though

 

Looks like it might be a Mugen Spec 1200cc that they ran in the old skool civics.

It is likely dry sump and running cams, itb's, and lots of compression. Pretty much a full on race motor that would require a rebuild after very few hours of use.