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It’s an aluminum block and there are some high spots of white powdery corrosion.

I was able to gently scrape most off using a (dull) metal paint scraper and a green scour pad, but there are some stubborn spots remaining.

Also I vacuumed out any fine particles from the scour pad that landed in the ports, but if I missed any that “may” have gotten deeper inside is that cause for worry?

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The best or accepted way was to run the manifold face on emery cloth which was on a flat plate or surface plate.

This would gradually reduce the high points.

If the amount needed was significant then a machine shop could machine it.

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  • It’s not the manifold itself but the engine side that needs cleaning – ohmmy Feb 22 at 11:42
  • Same applies - but if the head has studs then they need to come out. – Solar Mike Feb 22 at 11:56

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