Re: Aluminum engine restoration
Most cast aluminium engine components come out of the casting nice and shiny and that is how they are left. Over time they discolour and stain.
There is no method of part restoring short of hand polishing the rough cast finish with something like autosol and then de-greasing. I have fond using a brass wire brush shines the casting surface up nicely, but you can still tell it has been done.
In all honesty, degrease clean off any bad casting marks, send the bits to a bead blaster and then get it powder coated in any one of the amazing finishes you can get now. Powder coating is relatively inexpensive and incredibly durable.
Cheers Mark
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