No, it has a timing chain.
The Lexus GS300 qualifies as a midsize sedan. This is a great car, and it has only improved with each new generation Lexus has released. Its latest design was in 2006; however, the 2006 model was discontinued after a year and then rereleased as the GS350. Lexus made the GS350 in a response to the consumer complaints about the lack of power in the GS300. The GS350 was released with a 3.5 Liter V6 engine. Both the GS300 and the GS350 are identical except for the beefed up engine. Hope this helps.
The 2010 Lexus IS-350 is 5 ft. 10.9 in. (70.9 in.)1 subwoofer(s) wide.
The 2010 Lexus IS-F is 5 ft. 11.5 in. (71.5 in.)1 subwoofer(s) wide.
The 2010 Lexus IS-250 is 5 ft. 10.9 in. (70.9 in.)1 subwoofer(s) wide.
PLIZ HELP How can i reset the injector maintenance required in lexus gs350 2012
The 2010 Lexus LS-460 is 6 ft. 1.8 in. (73.8 in.)1 subwoofer(s) wide.
The 2010 Lexus GS-450H is 5 ft. 11.7 in. (71.7 in.)1 subwoofer(s) wide.
http://www.clublexus.com/forums/showthread.php?t=338155
The 2010 Lexus ES-350 is 5 ft. 11.7 in. (71.7 in.)10 -way power driver seat wide.
The 2010 Lexus LS-600H-L is 6 ft. 1.8 in. (73.8 in.)1 subwoofer(s) wide.
The 2010 Lexus IS-250-C is 5 ft. 10.9 in. (70.9 in.)10 -way power driver seat wide.