What does it mean to resleeve an engine and what’s the difference between the engine head and block?
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Inside your engine are chambers called “cylinders” and moving within the cylinders are parts called “pistons”. The pistons move up and down with furious speed and force constantly and that’s what produces the energy in your engine.
Overtime those moving pistons can damage the lining of the cylinder and that’s no good. A “sleeve” in this case is a lining you can put around the cylinder. It varies from car to car, but you can consider the lining of the cylinder “consumable” meaning it’s going to damaged over time and eventual repair should be expected. The sleeve just a replacement “cylinder wall lining”.
Sometime you need to get *into* the cylinder to do work (like replacing a sleeve) so you can’t just make an engine out of a massive single chuck of hollowed out metal, you need it to come apart.
So engines come in 2 basic pieces like a sandwich, the top piece is called a “head” and the bottom piece is called a “block” (because it’s bigger). The two are mechanically fastened using bolts and there is a layer of compressible material between the two called a “Gasket” that seals the joint so gasses can’t escape.
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