What does it mean to resleeve an engine and what’s the difference between the engine head and block?
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The block is the main body of the engine, and contains the cylinders in which the pistons will move. Those cylinders are open on the top. The head is the part that bolts onto the block and “tops” the cylinders – it also has the (complex) valves in it, holds either the camshaft (in an overhead cam engine) or the rockers (when the cam is down below), and the spark plugs and fuel injectors. Between the two (block and head) is the “head gasket” to seal them. Lining the cylinders are the sleeves – those provide a bearing surface for the pistons, which are sealed against them with the piston rings. Re-sleeving is replacing those sleeves, which can be worn or scored by the movement of the pistons.
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