![]() ![]() ![]() The polymer coating also dampens noise generated by the piston’s movement. To further reduce wear, the pistons are coated with a polymer material that limits bore scuffing, or abrasion of the cylinder wall over time from the piston’s up-down motion. Along with the rigid block, the engine’s rotating assembly was designed for optimal strength and duration complemented by features designed to make the L20 quiet and smooth. Its deep-skirt design helps maximize strength and minimize vibration. Cylinder Block and Rotating Assembly: the L20 4.8L provides a light, rigid foundation for an impressively smooth engine.These help reduce vibrations transmitted through the chassis and into the passenger compartment. Quiet features built into the engine are complemented by an improved engine cradle and mounting system. The 4.8L is powerful and delivers exceptional refinement to go with great strength. ![]() One of the enablers of the 4.8L’s balance of performance and efficiency is great airflow throughout. The Vortec 4.8L V8 L20 is the entry-level V8 engine. ![]()
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