can it be done NA and i mean NA


compression im not worried about was thinking in the range of a 12:1 good heads and cam package forged pistons rod bolts


im thinking of the TEA trickflow heads and cam package supervic carb intake 950hp carb on racegas or E85 setup

 

Basically you're after 100hp per liter, to get 450 rear wheel horsepower since that's about 520+ flywheel horsepower. Why 450? Why not 449? It's just a number, what is your end goal?

At any rate, you're going to have to spin this thing to high hell to make that kind of power. Plan to replace the entire rotating assembly with forged internals due to the extreme increase in tensile and compressive loads that come about revving over the stock red line. Making your horsepower goal will be much easier with more displacement, and if you're going to be buying a completely new rotating assembly in the first place, why not bore and stroke the 5.3L to a 6.3L? Your goal of 520+ flywheel horsepower will be much easier to obtain. Unless you have something to prove by making a 100hp/liter 5.3L, I do not see any other reason to go after such a feat, but that's just me.

 

Unless you have custom pistons made for a 5.3l you won't do it period. You have to up the motor size to find pistons able to handle that.
Having custom pistons made for a 5.3l is kinda stupid unless you just got money to burn and really hardheaded honestly. Maybe you got somthing to prove who knows ethier way i'd just go with a larger motor like inchup said.
But if you do be sure to post up on it.

 

Sure it can be done......no telling how long it will last. There's a couple of trucks on here that have put down just over 400hp TTG. I put down 390hp in 82* weather........I'm sure with cooler weather ahead, I could get it over the 400hp mark in a 4X4. I didn't want dyno numbers from the begining. I wanted to meet or beat blue cajuns time of 12.48e.t. It just so happens that I got my truck dyno'd and this is what it put out.......

James

 

Price out a 6.2 and drop it in then cams, intake, exhaust, tune should get you around 500hp at the fly

 

man honestly all the 6.0's im find around here are high dollar money and i stumbled onto a 5.3 longblock with few extra parts for cheap so i thought why not try for it


so i may just go for the 12:1 6.0 with good internals and heads cam combo and go for it

 

turn the 5.3 into a 5.7 and start from there.

 

just how much wall thickness is there after the bore in the cyl's that has crossed my mind already


i know the 3.905 bore is total max on the 5.3 which got me worried about cyl pressure

 

many have done it just be sure the block is checked after it is bored. if you are staying n/a it should be fine.

 

you can get a 5.3L all the way to a 383 with a 3.9 bore and a 4" stroke and make your power much easier