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Carburetor cleaners are made to remove carbon and varnish. I would use that on the closed valves, vacuum out, then rotate the engine over to do the others. Afterwards I'd run it for a couple minutes and then do an oil change. What your seeing is why I do my own induction cleaning at every oil change.
The other option is to get the gun at Harbor Freight to do the walnut blasting.
How many miles on it?
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2018 SS wheels, red Heritage grille, actual driving lights, ZL1 strut tower brace, GM Performance billet aluminum fuel door, front grille Bowtie delete, painted red rotors and calipers, 1/4 window American Flags, splash guards, AEM dry panel air filter.
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