Bead or Vapour blasting and oil galleries.

fiatfan said:

So you dont need to treat or paint them afterwards? That sounds just great! Do you know what they used in their ultrasonic cleaner?

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Sorry, no idea what cleaning solution, but we're talking seriously expensive, massive industrial ultrasonic kit that easily swallowed a Bentley cylinder head! It would be a crime to paint the alloy afterwards, it looks so beautiful. All I do is spray it once after blasting with wd40 just to offer some corrosion protection.