block to fail the HD truck market, the iron block, lack of both stop-start and cylinder deactivation, longer stroke and rod ratio, lower compression, mere 87 Octane requirement, and greater displacement all suggest that the L8T was designed specifically to assuage the HD truck market's concerns. Applications: 3.78 in. bore blocks (2014–present) Unlike the previous Generation III/IV bore block families, there is no displacement variant (having been 'replaced' by GM's 5th Generation LT V8-based V6, the LV3). 5.3 L L83 Dubbed EcoTec3 is a Generation V small block V8 truck engine (VIN Code "C"). Like its Vortec 5300 Generation IV predecessor, it gets its displacement from a bore and stroke of with a compression ratio of 11.0 to 1. Applications: L8B The L8B is an eAssist mild hybrid version of the L83 featuring a .45-KWH lithium ion battery pack. This setup can improve fuel efficiency by about 13%. This adds about to the total weight of the truck but provides an additional and . Applications: L82 The L82 is one of two 5.3 liter V8s available in the 4th generation Chevrolet Silverado and 5th generation GMC Sierra. The L82 uses Active Fuel Management instead of the L84's Dynamic Fuel Management system and is only available on lower-trim trucks. Applications: L84 The L84 is one of two 5.3 liter V8s available in the 4th generation Chevrolet Silverado and GMC Sierra. The L84 is distinguished from the L82 by the presence of the Dynamic Fuel Management System and is either available or standard on mid- to high-level trims. The L84 is also the base engine on the 2021- Chevrolet Tahoe, GMC Yukon, Chevrolet Suburban, & GMC Yukon XL. Applications: 3.921 in. bore blocks (2014–present) These V6 engines are based on the V8 version of the Gen V family, but with two fewer cylinders - a design lineage that dates back to the previous 4.3 L V6, which was itself a Gen I small block with a pair of cylinders removed. Of special note, there were no V6 engines based on Generation II, III, or IV small-block V8s. 4.3 L Dubbed EcoTec3 is a Generation V small block V6 truck engine. It gets its displacement from bore and stroke of with a compression ratio of 11.0 to 1. Firing order is 1-6-5-4-3-2. This engine replaces the unrelated 4.3 L V6 whose lineage dates back to 1978. LV3 Applications: LV1 The engine is essentially