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The 2010 Lexus IS-F's engine produces 371 ft-lbs. @ 5200 rpm.
In 2010 Lexus RX350's started using Timing Chain's in the 3.5 engine, which require no maintenance (unless very high mileage is reached or parts failure). Earlier years <2009 had timing belts. I verified the 2010 model has a timing chain via contacting a local Lexus parts department.
The 2010 Lexus IS-250's engine produces 185 ft-lbs. @ 4800 rpm.
The 2010 Lexus IS-350's engine produces 277 ft-lbs. @ 4800 rpm.
The 2010 Lexus GS-450H's engine produces 267 ft-lbs. @ 4800 rpm.
The 2010 Lexus IS-250-C's engine produces 185 ft-lbs. @ 4800 rpm.
The 2010 Lexus IS-350-C's engine produces 277 ft-lbs. @ 4800 rpm.
The 2010 Lexus GX-460's engine produces 329 ft-lbs. @ 3500 rpm.
The 2010 Lexus LX-570's engine produces 403 ft-lbs. @ 3600 rpm.
The 2010 Lexus GS-350's engine produces 274 ft-lbs. @ 3600 rpm.
The 2010 Lexus LS-460's engine produces 367 ft-lbs. @ 4100 rpm.