Keep in mind that those kseries making 300+HP na are vtec heads... I was once big into Hondas for many years as they were cheap and easy to build for fun street cars, but you take a vtec engine, disconnect the VTEC solenoid and that engine is going to run like poop compared to the power you're making with vtec funtioning. But, I realize these heads are being produced as a non VTEC head, so I'm sure they'll run healthy. Just don't make the mistake of thinking it'll make equal power to a VTEC head, cause it wont.