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no the 1999 will be an LS style engine
Yes they are the same. Gm still used the old style 350 in 99 also. The LS style is not a 350ci.
LS engine
In GM trucks or new GM cars, the 8th digit of the VIN # is the Engine.
The 2008 Lexus LS-460 has a V8 engine.
The 2007 Lexus LS-460 has a V8 engine.