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I have a real LSX454 in my 2013 Regular Cab Short Box Sierra. It's a Turn Key Engine prepped NA GM crate engine with a GearStar built 6-speed auto trans. On the Dyno it put out a conservative 650HP/640TQ. I've had FI motors in the past and thought about going that route again before going this route. However this thing is bad ass and should be reliable as well. Turn Key Engine Supply also offers a supercharged version rated for more performance. Of course it has lower compression and is built for FI. They lean toward reliability in their builds. What are trying to accomplish? Racing or looking for a great set-up for the street?
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