yes aem does make adjustable cam gears for the zc. whats your email address? i'll send you a pic of mine. eagle makes rods and pistons for the zc. im sure theres other companies that make the parts. my friend also has a zc and has the eagle rods and pistons for it. i believe he put in high compression pistons and is pushing about 160-170hp all motor. also a good site for basic zc shit is (
www.quickhonda.com) gimme your email and i'll send pics tonight, cant right now cause im at work.