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I take the bare block to an engine shop for a hot caustic bath. When I get it back to the workshop I hit with some degreaser and a good pressure wash. When its dry I coat the entire engine with RANEX Rustbuster (available from bunnings) give the water jackets a good soaking and let sit for about half an hour (use a spray bottle for best coverage) then resoak the entire block again with RANEX and pressure clean after about five minutes let dry and coat again with RANEX and then coat with degreaser and then pressure clean air dry and apply CRC, WD40 or INOX do this before any machine work and make sure to polish your lifter bores and clean any machined surfaces that are not going to be machined during the rebuild. Also a warning when using RANEX use a dust filter when spraying and dont breathe the vapours they are very strong and will leave you not feeling very well feels like an ashma attack