i have a STOCK B20..that includes the head. now, without looking at the engine code stamped onto the block, its practically impossible to distinguish a B20 engine to a B18B. but regardless, my dad has a test only smog station :thumbup: as long as my car passes the sniffer test, its cool with him. besides, i dont even think my dad knows i have the B20. he just knows that i bought a new engine to replace my blown b18b. and since it looks the same i guess he didnt bother to check the engine code.