Decent fuel economy and still a V8. Decent low end torque for their size. They all (5.3) fall in between 290-310hp. If you keep the carbon from building up in the chambers, they run nice and smooth. 5.3's are a dime a dozen. The next SBC that everyone will have (aftermarket parts availability). The main difference between a 5.3 and 5.7 is bore size and cam. They don't require a zinc additive to stay alive. VVT has been out for a couple of years, so the aftermarket tuners will catch up with this soon and really change the game with the ability to fine tune for max power and drive-ability/economy (I know this is already an advantage of the LS engine, but there is always room for improvement). IMO's
Disadvantages are:
initial cost of the swap
Active Fuel Management engines are known to burn oil due to low tension rings and highway use of the AFM on cylinders 1,4,6,7
AFM engines are also known to sometimes chew up a lifter/lobe.....usually on the #6 cylinder
Disadvantages are:
initial cost of the swap
Active Fuel Management engines are known to burn oil due to low tension rings and highway use of the AFM on cylinders 1,4,6,7
AFM engines are also known to sometimes chew up a lifter/lobe.....usually on the #6 cylinder