These are for a single High Lift Valve Spring Set (16) for Honda SOHC VTEC 16 valve type engines, D16Z6 and D16Y8 engines. Crespo d16 valve springs..rev at 7000-7500 rpm or more depending on a build. Used for about 5k miles. Im buying all crower head parts now. Valve springs worked great had a longer redline with my build. $65 shipped
