w5kvv
+1y
5.3's are a dime a dozen, aftermarket support for any LSx motor is thru the roof. Hot Rod just did an article on how much power a bone stock junkyard 5.3 could make before it came apart. They bolted on two HUGE turbos, used a aftermarket computer, but everything else was bone stock with 100k miles. Long story short, their junkyard 5.3 turned out to be a 4.8 & it made 1200+ hp, on 6 different pulls before it chunked a ring.
5.3, or any LSx motor is the way to go if you're looking for GM power.