ok now i have to retract some of what i said earlier. i brought out the service manuals and this is what i found. zx9-zx10, cam lobe height[not lift] 1.410-1.414 " timing zx9 intake opens 45 deg. btdc int closes 65 deg abdc ex open 65 deg bbdc ex closes 45 deg atdc. zx10 int opens 40 deg btdc int closes 70 deg abdc ex opens 65 deg bbdc ex closes 45 deg atdc. lift is the same for both cams [note the same lobe height] but intake timing is different. this is done through the cam grind. zl9/zl1k lobe height app. 1.388" [ taken from my good used cams from my zl1k]. zl9 timing int opens 37.5 deg closes at 57.5 abdc ex opens at 57.5 bbdc closes 37.5 atdc zl1k is same. so yes you can use either cams [sorry for the wrong info earlier] lift is app. .020 more with the zx cams. it is the cam timing that will throw the proverbial wrench in. some of that can fixed with adj. sprockets and proper tuning etc. so zl9/zl1k cams are the same. zx9 and zx10 cams are different.again sorry for misleading anyone hope this info helps. as soon as i get to the dyno i will post the info with zx10 cams degreed in. to clarify all the cams will interchange but will act "different" when it comes to "the numbers".