Would there be any reason to run a 4.8 over a 5.3? Both are gen 3 with around 60k miles. Looking to get around 700 rwhp. For some strange reason I want to run the 4.8. Thanks

 

4.8 has a shorter stroke and a better rod/stroke ratio. Theoretically its the best setup for boost as far as crank and rod longevity goes. It might take longer to a pool the turbo, but its still just as capable.

A 4.8 crank in a 6.0 block comes back out to 5.3 liters, but with the added benefit of the shorter stroke and the ability to run ls3 heads.

 

Awesome never thought of the shorter stroke

 

As far as JY builds go, I can think of a couple...

Cost- Not many want them, so they should be the cheapest option. Shoot for 2005 and up.

Converter- Because you can rev the 4.8 higher you can get away with a larger/cheaper converter. (less converter slip)

 

agree with all points above.

also add that with some smaller turbos, the 4.8 can actually make more peak power.

 

I would look at them in person and pick the cleanest looking one. I had this decision a couple weeks ago. Looked at 4.8 and it was caked in mud and grime. Ovbiously ran hard. 5.3 looked much cleaner so I snagged that one. JMO, the 5.3 has the advantage of more cubes. It's only 1/2 liter but with boost it allows room for much more air. I'm no expert on them though.