I would never thread into a oil pan. Theyre really not that thick. I would just pull the pan and put a bulkhead fitting or.. you can put a big dab of grease on the pan and tap the hole, the grease should get the shavings and just flush the oil out after?
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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