Is there some kind of liquid chemical I can soak them in, or do I have to find a super thin wire brush to get in there? What have you guys done?

use a wire brush, or have them media blasted

bacardi takes rust off good too

HAHA

be careful around the spark plugs and the exhaust port, the casting is thin there



mike

nice pic, rum, coke, rotor housing, and hammer.



danger will robinson, danger.

I use black beauty on my blasting machine

i used a wire brush and machine oil ... then clean it with a good organic solvent



(save the Bacardi for when you're trying to massage the cramps out your hands https://www.nopistons.com/forums/pub...)

same **** here ito

I use the "Dremel" tool with different attachments first then power wash it clean, follow by a ggood dose of air from the compressor.