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The bottom end of any engine build is just about the most important link in the chain. You can have the highest flowing heads, largest carburetor, and greatest manifold, but they will suffer if the bottom half of the engine is poorly built. The Jenkins/Smeding small-blocks all start life with a Dart Little M block. The bore size of each cylinder is opened up to 4.155 with a special cross-hatch honing that aids the rings in sealing and oil retention.