GM LT Engine

GM LT Engine

The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.

General Motors' Generation II LT is a small block V8 engine. Making its debut in the 1992 Chevrolet Corvette, the new LT sought to draw upon the heritage of the 1970 Chevrolet LT-1.

A significant improvement over the original Generation I V8 is the Generation II LT's "reverse cooling" system, allowing coolant to start at the heads and flow down through the block. This keeps the heads cooler, affording greater power through a higher compression ratio and greater spark advance at the same time it maintains higher and more consistent cylinder temperatures.

Some parts from the Generation II are interchangeable with the Generation I one-piece rear main seal engine. The interchangeable parts include the rotating assembly (crank shaft, pistons, connecting rods, and flywheel/flexplate) and valvetrain assembly (not including timing set, which includes a gear to drive the water pump). The LT uses a new engine block, cylinder head, timing cover, water pump, intake manifold and accessory brackets. The harmonic dampener also does not interchange; it is a unique dampener/pulley assembly. Engine mounts and bell housing bolt pattern remain the same, permitting a newer engine to be readily swapped into an older vehicle.