there is nothing wrong with the crvtec or the ls vtec. but some people just slap them two together and think they can rev like a normal vtec. but the ls and crv cranks are not balanced like the vtecs are. so if you want to spin high rpms then get the crank neutral balanced and have the intake side of the piston shaved a little more than normal and you can spin any rpms you want. well nothing like 10,000 but it has been done. if you are interested in ls vtecs and crvtec then really do research before relying on others to tell you what they did. lsvtec and crvtec is the best of both worlds and i mean power and price.