I have had the stealth heads on my car for two years now. The valves were poorly cut, stem heights were off as well as the spring installed heights. After a year I had the valve guides replaced as well. When I replaced the cam I also replaced the cheap springs, locks and retainers. Now I have about 2K in the heads including porting.

Mine are painted which makes my stroker look somewhat stock. Would I buy them again, maybe.