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No need to remove the cylinder heads, the intake is all that needs to be removed if you want to walnut blast them. But they can be chemically cleaned and thats how the dealership does it.
Me, i just clean mine chemically before every oil change and theres plenty of vids on the 'tube to show you how do an upper induction cleaning. That stuff is designed to remove it too.
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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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