You can wotk a little bit and make your own...all you need is an air compressor, air tool and one of the polishing kits from
www.summitracing.com
sorry bogdan but its far from being that simple lol.
ive seen many diy efforts and pro as well and some of the work is shocking to say the least!
when a head is ported it MUST be done correctly and flowed correctly, if it isnt then you will end up with a slow very lumpy unbalanced engine and the head is as good as scrap!
you can count on one hand probably the people in uk that can carry out this work to a very good acceptable level, and the best guy is based nr heathrow, but he takes bookings 3 sometimes 6 months in advance as hes that good.
dremmel and compressor simply doesnt cut the mustard so to speak:lol: