Aluminium alloy heads are 'cold tanked' in solutions usually based on Methylene Chloride with napthene and other additives....'Carbo Clean' is one brand name. Nasty stuff.

OTOH cast iron heads and blocks are 'hot tanked' in alkaline solutions which would actually dissolve an aluminium head given long enough....



I am cleaning up a suspect head, how do the head shops get them so clean? When I have got heads back from them they have always been so clean that any corrosion/cracks etc sticks out like crazy.

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