The TVR Speed Six is the name of a straight-6 engine manufactured by TVR and used in several of their cars incuding the TVR Tuscan, TVR Cerbera and TVR Tamora .
The engine is produced in several displacements from 3.6 L to 4.2 L, essentially with the same piston size but different stroke lengths depending on the power needed for the application.
TVR developed it into the limited-production V12 Speed Twelve racing engine.
