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On the top side of the block there’s another change that must be made to improve oil control in racing applications. In stock form, the oil galleries bleed way too much oil into the lifter bores. To help control oil here and maintain proper oil pressure to the crank journals, the only real solution is to have all 16 lifter bores bushed with liners that have an oil feed hole between 0.100 and 0.125-inch. It’s a bit of an expensive upgrade, but you also get the benefit of better clearances between the bore and the lifter which significantly reduces the chance of a seized lifter. View Related Article
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