Unless I'm mistaken the LS4 was a 5.3L V8 front drive in Grand Prix GXP, Impala SS and a Buick. Mid 2000's. The Twin turbo 3.6 is an LF3.
You can still build a unique SS or ZL1 with more power for less. There ain't none like mine anywhere around here. 
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Mr Russ
Tim "the tool man" Taylor is my hero
My Garage:
'16 Chevrolet Camaro 2SS, Summit White, Adrenaline Red
-- Rotofab CAI, Soler TB, 1 7/8 coated LT's, Full 3" mids, 3" Stainless Works NPP mufflers, Flex Fuel, E85/91 tuned
'20 Honda Oddysey Elite 25th Anniversary Edition
--wifes car, she said "No more SUV's" after the 2 CX-9's totaled
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