im useing a stock head, and its onlu the one side, the right, so i dunno, i tighed down teh head and its still doing it, i think im onna take the head off, and cheak the gasket, and maybe put some hi temp silicone aroun dteh seal, and if it still does it, let it go, lol, or is it harmful to my engine, and i really cant ttell if my levels dropping, im just letting it idle to break it in....