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You can easily handle the walnut blasting on your own. Harbor Freight sells a media blaster for like $50 and you can also get the crushed walnut shells from there as well. $25 for 25 pounds. Hook it to a good compressor, pull the intake off, and go to work. Rotate the engine until the intake valve is closed and the lifter is on the base circle of the cam. (Sounds a lot harder than it is). Blow out the remaining shells with compressed air. Anything that you don't get out will be burned off.
Its far from rocket science. I used to do it to my Focus ST. It took about an hour on a cold engine, and that was with me lollygagging.
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