37gc In another life I worked in a diesel shop that had a huge caustic tank that we brought to a boil,it would really cut the gunk off of stuff. It was slow,we needed something faster for head work so built a much smaller 2ft x 3.5 ft. tank. It would heat up while your gutting and scraping the heads. Our local oilfield supply has caustic soda like you use in those tanks. That would be reasonable in price.
