Honda Closed Decking ServiceFor K20, K24, B16, B18, H22, H23, D15, and D16 Engine Blocks Our Closed Decking service for Honda engine blocks is designed to reinforce the engines structural integrity, especially at the top of the cylinder walls where combustion pressure is at its peak. This process involves machining the top plane of the engine case to accept precision CNC machined inserts, providing full support to the cylinder walls and minimizing the risk of flexing or cracking