On my L89 heads and intake I used a Martin Senour Metal etch and a stainless steel toothbrush type brush and they turn out fantastic, I use this same product to clean alternator cases and distributors, just another way to make it happen if you don't have the tools for the other techniques listed here,
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Rich Straub
raiv 69 judge, ra3 70 judge, 71 judge,74 SD trans am,71 cudas, 67 189 Corvette roadster, Quicksilver 68 HURST
z-10 396 camaro, 69 HEMIBEE
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