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i want to restore my valve covers. They are the early c-3 finned...What is the best way to brighten them up? I am guessing a drill attachment. i do not want to mar the finish but take out the discoloration. 73 l-82 engine. any compunds to use on them? Thanks in advance for the advice.
 

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i want to restore my valve covers. They are the early c-3 finned...What is the best way to brighten them up? I am guessing a drill attachment. i do not want to mar the finish but take out the discoloration. 73 l-82 engine. any compounds to use on them? Thanks in advance for the advice.

If you have a sandblaster you might try blasting them with crushed walnut shells. Glass beads would work but they'll leave a rougher finish. And using sandblasting sand will turn them a light gray color.
 
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