i need help im buying a 5.3 dirt cheap what would i have to modify and what would be good power combos my goal is 400hp

 

welcome aboard.

this'll probably get moved anyway, but your best bet would be to dig through the LSx swap section, as this is part of the same family. lots of members have done these swaps, so dig around around and see what some others have come up with for combos

there is a lot of work (and a decent chunk of change) to get this engine in one of these cars, but can be well worth it.

 

Step #1 is to read the LS1 swap sticky. This is basically an LS1 swap with the truck engine twist.

There's a link in there regarding what you need to do when starting with a truck engine.

 

Are you trying to get 400hp at the rear wheels or at the flywheel?

 

400 at the wheels

 

Power adder is the easiest way

 

cam, heads, headers, and a great intake.....super chevy just did a write up on it, its called modern mouse.

or save your money up for a 6.0L and its much easier and less expensive on the backside.