I've removed the head from the D15B Vtec to replace the gasket, so I'm taking it into a shop to check for warpage and get a bolt extracted from it. But I figured while I'm there why not ask how much for a port n polish job? So what would the average P-N-P cost? And do you just walk in there and ask for a port n polish? Or are you supposed to tell them how much you want the ports widened? Also, what kind of gains could be expected? I'm only expecting maybe 5 hp, maybe 10-15 with a Blox intake manifold? Thanks alot for any responses.