what is the difference between the intake and exhuast springs other than the intake being dual valve springs.... the reason im asking is i dropped two heads off at a machine shop for a valve job on one head....one head is screwed up and is using it for parts.... well i go pick my head up and he put the dual valve springs from my bad head on the exhaust side of my new head... so now i have dual valve springs... will it hurt to run them like this