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For mine I went in steps. First I power washed the block, then I used some oven cleaner, then Castrol Super Clean along with some (okay, lots of) scraping and brushing with an old toothbrush. Finished with lots of rinsing with Lacquer Thinner to get it ready for paint.
Don't get the oven cleaner near the seals or anything aluminum.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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