Have this idea rattling around in my head... I currently am running my stock LM7 with ~115k miles and am thinking it may not last long with my ~600rwhp goal. Apparently the rods are pretty weak on these motors and will be the first thing to go. So I'm thinking of building up another 5.3L as a spare.

Block: My thought is to use a used 5.3L iron block, or would an aluminum 5.3L block be able to handle the power? Is a Gen IV iron block better than a Gen III?
Crank: Stock should suffice.
Rods: No idea.
Pistons: No idea.
Rings: New, gapped for boost?
Misc: ARP rod bolts. New main and rod bearings. Maybe ARP main studs?

What sponsors can build this for me? I can't find any that offer a simple 5.3L online, but perhaps I just need to ask them.

 

Get a 2005+ 5.3. Will do 600 easy.

 

in stock form..

 

You mean a stock junkyard 5.3L motor?

That would be the cheapest option, but if I'm going to replace the motor then I might as well spend a little more and beefen it up. 600rwhp is the goal, but once I reach it then it's onwards and upwards

 

About what power are they good for?

 

Spend as much as you like, its your money. But the late model 5.3 will probably last forever at 600 with a proper tune.

 

do head studs, cam, rod bolts and springs

 

600 RWHP will be a cake! Get a specd cam for the turbo you will be using, springs, better rods, head studs, and 60lb injectors.

 

How much boost in general will it take to hit 600 rwhp on a 5.3 in a truck?

 

≈15#'s