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First step is to assess specs on what you have to work with.
1. Measure head and deck flatness. If they are within spec, no lapping needed. If warpage beyond spec, then lap to within proper spec
2. Still no pictures of crank rod-journals. Flip bottom end over and remove con-rods. Crank may really be toast and the sooner you find this out, the less time and money you’ll waste.
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