Thanks guys, Hydro Blasting (or Vapor Blasting, Vapor Honing etc, which are all fancy names for the exact same method) is just a slurry of blasting media and water fired at the target with the help of compressed air. The benefit being that you get a finer, smoother finish, and it's dust free. Silica dust will kill you, so that's a good thing.
If you were good enough you could use an attachment on your pressure washer that sucks blasting media into the water stream, I've seen lots of Youtube videos of guys using this method to strip the paint from cars, but for motorcycle engines and small parts, it just wouldn't be as effective.
Carlo uses a large hydro blasting cabinet which is a much better way of doing it, as he can work comfortably in any weather without getting wet. I'm thinking someone really smart could make their own Hydro blasting cabinet using a cheap pressure washer and a big air compressor, I'd love to be able to do this at home.
Here's an interesting pic of two of the exhaust ports on my early Sandcast head, there's quite a difference in the shape of the ports, no wonder CB750 heads respond so well to porting and polishing!
K0 ports by
terry prendergast, on Flickr
