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Oil system mods continue in the valley area of the block, as Mark tells us the factory drainback holes are inadequate for high-performance engines. He will chamfer and increase the size of these holes to aid drainback from the top end dramatically. The 460 has a natural angle of about 3 degrees nose up when installed in a chassis, so these two holes at the rear of the valley are relied upon to return most of the oil to the pan, and they need to be larger. View Related Article
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