Block cleaning

on that rust you can use a non phosphate remainder acidic cleaner like CLR or lime a way or make your own from some pool acid
But you then have to neutralist with some baking soda solution, hot tide, then rinse and then immediately oil and bag as the oil will attract dust like
crazy
best to do this with a completly stripped block (no cam bearing dirt traps) and after you have drilled the main feeds and any other clean up
like pressure feeding the thrust do have all the plugs and the second oil sender plug out on B/RB- everythiong
acid will not work on oil so if there is oil over the rust you have to use steaming hot tide power first then acid clean
a caustic soda hot tank will do it too