610 6-1. Specifications
Ignition system
Spark plug4.0 L V6 (1GR-FE) engine
Make DENSO NGK
Gap
K20HR-U11
LFR6C11
0.043 in. (1.1 mm)
4.7 L V8 (2UZ-FE) engine
Make DENSO NGK
Gap
SK20R11
IFR6A11
0.043 in. (1.1 mm)
5.7 L V8 (3UR-FE, 3UR-FBE) 
engine
Make DENSO
Gap
SK20HR11
0.043 in. (1.1 mm)
NOTICE
■ Iridium-tipped spark plugs (4.7 L  V8 [2UZ-FE] and 5.7 L V8 [3UR-FE,
3UR-FBE] engines)
Use only iridium-tipped spark plugs. Do not adjust gap when tuning engine.