I ran jdm type S cams on a H22A4 for like 55k miles, and the valvetrain was in perfect condition. The head was completely stock except for the type S cams. The bottom end of the engine failed, but the top end was in excellent condition, so good that I bought a shortblock and reused the same head. Later I ended up getting a jdm type S engine, and never had any problems out of it either.