The 350 is a GM engine made from 1967 to 2003 which is actually 349.57 cubic inches or 5.73 liters.
The 2009 Lexus IS-350 has a 3.5 L base engine size.
The 2007 Lexus IS-350 has a 3.5 L base engine size.
The 2011 Lexus IS-350 has a 3.5 L base engine size.
The 2014 Lexus IS-350 has a 3.5 L base engine size.
The 2006 Lexus IS-350 has a 3.5 L base engine size.
The 2012 Lexus IS-350 has a 3.5 L base engine size.
The 2010 Lexus IS-350 has a 3.5 L base engine size.
The 2008 Lexus IS-350 has a 3.5 L base engine size.
The 2013 Lexus IS-350 has a 3.5 L base engine size.
The 2013 Lexus IS-350 has a V6 engine.
The 2012 Lexus IS-350 has a V6 engine.
The 2011 Lexus IS-350 has a V6 engine.