Originally Posted by fastball
Yep. I don't know of any Honda engine that is not interference.
The S2K might be considering the timing device is chain driven and not belt driven.
It doesn't have anything to do with chain v belt. FYI, the K and R series engines are all chain driven as well.
On a side note, the S2000 uses only 2 sprockets...the upper sprocket drives twin gears. One is a 'scissor gear'...basically, the gear is sliced in half and fitted with a very stiff torsion spring connecting each half which reduces gear backlash. These drive the camshafts. Very, very cool.
edit: TODA makes adjustable gears, you can see how the one on the left is the scissor gear:
