Appearence? There's literally no chunks of carbon on the threads. They're tapped for a bigger size pipe, that's all.
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Cubs: 1986 CCC 1912 Kawasaki swap, 1984 MTD 782D, 1985 CCC 1210
Other tractors: 69 Deere 3020, 69 Deere 140 H2, 64-ish Burns B60
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