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You can machine your small-block's #5 rear main journal and crankshaft to accept a one-piece rear main seal, but it's not a budget procedure. When you're on a strict budget, you're stuck with the old two-piece rear main seal. Marvin suggests staggering the seal and main cap parting lines to prevent leakage. After the crank is set, Marvin applies a dab of Permatex High Temp silicone sealer to the seal and main cap parting lines for leak-free performance.