Yes they can be purchased as PLATED, Millennium does the coating, but the bad thing is the the ports windows are just deburred and leave room for improvement power wise. Not that they can not be still cleaned up but its very hard to cut thru the nicasil and adds allot of time to porting so allot of builders port a unfinished cylinder then send it out. The port tunnels, exhaust port and intake port also need a little fine tuning but if you own a dremel that can normally be done by the typical do it yourself guy.