GM LT3 V-8 Engine
The LT3 is believed to be a future eight-cylinder engine from General Motors.
Following is speculative and unconfirmed information about the future GM LT3 engine. This page is a continuous work-in-progress and will be updated on a regular basis as we await official details from General Motors.
If you notice any inaccuracies about the information provided, or have edits to suggest, please let us know here.
Currently, no official information is available about the LT3 engine, including specifics such as its displacement, output, and configuration.
We can, however, deduce a few things by reading the proverbial tea leaves. The biggest hunch we have about an LT3 engine being in the pipeline is the naming space available between LT1 and LT4 in GM’s engine RPO codes: though GM has released the naturally-aspirated LT1 and supercharged LT4 overhead valve V-8 engines, it has yet to release an engine with the LT2 or LT3 RPO designations.
LT3 engine specifications are currently not available. We will update this page when we have more concrete information about the motor.
It is currently unclear which GM engine family the LT3 engine will belong to.
On the one hand, the “LT” nomenclature suggests that LT3 belongs to GM’s fifth-generation Small Block overhead valve engine family. If that is the case, then the engine will likely be an updated version of the LT1, and will therefore have much in common with the following GM Gen 5 Small Block engines:
- 6.2L V-8 LT1 naturally-aspirated
- 6.2L V-8 LT4 supercharged
- 6.2L V-8 LT5 supercharged
- 6.2L V-8 L86 naturally-aspirated
Other engines that are part of the same GM Gen 5 Small Block engine family include:
On the other hand, it is also possible that the LT3 motor will feature a Dual OverHead Cam (DOHC) design and therefore not be at all related to General Motors’ Gen V Small Block engines.
Whatever the configuration of GM’s supposed LT3 engine, we expect it to have eight cylinders.
We will update this section when LT3 engine pictures become available.
Follow our coverage of LT3 news and developments.