Yea they are aluminum. They are clean except for the combustion and exhaust. I may try oven cleaner then power washing. Closest machine shop several hrs away and I just want to clean them up enough to remove the valve guides.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT