That's a used takeout from a junkyard based on the crate and tag on it.So it's a 5.3. How much hp?
New, new ? Or slightly used take out? 4L60E, have heavy duty internals? Just curious I've thought about a 6.0 in my K2500.
The LM7 is the iron block Gen 3 5.3L that was used in a bunch of trucks and SUV's(and others) from 99-2007. They vary in power, but ~290hp/315tq depending on year and application. A decent cam and tuning can help that out quite a bit. They did not have any especially heavy duty anything. The heavy duty engine would have been a 6.0L
https://www.onallcylinders.com/2018...ormance-bore-stroke-cylinder-heads-cam-specs/