head porting an polishing

i was offered a price of $250 for a 5 angle valve grinding, is this a good price? the porting is on my 04 yz250f, has anyone had there head ported? how much did it cost you? :)

hey i have herd that it costs about 290 but i dont know how much it does for the bike.

I'm just curious how much you milled the head and why?

i had it milled down .01 for more compeshion.

Did they happen to tell you what that modification (.01 off the cylinder) added to the compression ratio of the motor?

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