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Cryo treatment has proven to work very well. Check out the companies that perform the service and read their web sites. Parts are placed in a computerized machine that regulates how fast the temp drops, how long it holds and how fast it rises back to room temp. This time regulation is critical to correct treatment. I hear there are a couple of places that just put your parts in an ice chest, flood it with liquid nitrogen and come back later.... not good- use only a reputable company. Different alloys require different timing, if the vendor does not know this, find a new vendor.
I have used OneCryo in WA state. I did my cam/lifters/cylinders.
It works best on ferous metals but other metals also benifit from the treatment. I recall Jake saying that aluminum heads run cooler after treatment.
ken
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