[jeff s]

It's not a LS3 it's a 5.3 Alum block. I picked it cause it was cheap and light, 100lbs more than the original alum 4 banger.
If you look at the pics of the engine, it has a LS1 intake and water pump which will fit under the hood. I bought the LS1 intake and 2 other spares off craigslist for $35 ea.