born with the original small block in 1954. Structurally, the Gen-V small-block is similar to the Gen III/IV engines, including a deep-skirt cylinder block. Refinements and new or revised components are used throughout, including a revised cooling system and all-new cylinder heads. Because the positions of the intake and exhaust valves are flipped from where they would be in an LS engine, as well as the need for an addition to the camshaft to drive the high-pressure fuel pump for the direct fuel injection, few parts are interchangeable with the Gen III/IV engines. All Gen V engines are aluminum blocks (except for the L8T) with aluminum cylinder heads, and include direct injection, piston cooling jets, active fuel management, variable displacement oil pump, and continuously variable valve timing. However, they all retain their ancestors' two-valve pushrod valvetrain. 4.06 in. bore blocks (2014–present) This family of blocks was the first of the generation V small block with the LT1 being the progenitor of this family and generation. This family of blocks has seen a wide range of applications from performance vehicles to truck usage. 6.2 L LT1 The LT1 engine debuted in the 2014 Chevrolet Corvette Stingray and is the first Generation V small block engine. Like its LS3 predecessor, it gets its displacement from a bore and stroke of with a compression ratio of 11.5 to 1. Applications: LT2 The LT2 engine debuted in the 2020 Corvette Stingray as the successor to the LT1. It was designed specifically with mid-engine placement and dry-sump lubrication in mind. Applications: L86/L87 The EcoTec3 is a Generation V small-block V8 truck engine (VIN Code "J"). The L86 is an LT1 engine modified for truck use with a compression ratio of 11.5 to 1. In 2019, GM introduced the L87 as the successor to the L86. Power and Torque remain the same, but whereas the L86's 'Active Fuel Management' alternates between V-4 & V8 modes, the L87's 'Dynamic Fuel Management' can alternate between any of 17 different firing orders which vary both how many and which cylinder[s] are actually firing based on demand calculated every 125 milliseconds. Applications: LT4 The LT4 engine builds on the design strengths of the previous LS9 supercharged engine used in the sixth-generation Corvette ZR1 and leverages the technologies introduced on the seventh-generation Corvette Stingray, including direct injection, cylinder deactivation, and continuously variable valve timing, to take Corvette performance to an all-new