Toyota Tundra Quick Reference Manual page 674

6-1. Specifications
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Engine number
The engine number is stamped on the engine block as shown.
4.0 L V6 (1GR-FE) engine
4.6 L V8 (1UR-FE) engine
5.7 L V8 (3UR-FE, 3UR-FBE) engine
654
I n f o r ma t i o n P r o v i d e d b y :