Assertion: engine's compression ratio | /r/HasProperty | enabled by direct injection
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text: The LT4 engine is based on the same Gen 5 small block foundation as the Corvette Stingray's LT1 6.2 L naturally aspirated engine, incorporating several unique features designed to support its higher output and the greater cylinder pressures created by forced induction, including: Rotocast A356T6 aluminum cylinder heads that are stronger and handle heat better than conventional aluminum heads, lightweight titanium intake valves, forged powder metal steel connecting rods which are highly machined to an optimized geometry for increased strength while eliminating unnecessary reciprocating mass, 10.0:1 compression ratio, high for a forced-induction engine, enhances performance and efficiency and is enabled by direct injection, forged aluminum pistons with unique, stronger structure to ensure strength under high cylinder pressures, stainless steel exhaust manifolds for structure at higher temperatures, aluminum balancer for reduced mass, and standard dry-sump oiling system with a dual-pressure-control oil pump.