400hp on 5.3?
 

Just curious as to what it takes to get 400hp on the motor for a 5.3? What bolt ons are needed, cam size, etc. Im talking flywheel hp. Thanks.

Hell, I think i was there with the lt's, cam, shift kit, servo tune.

Are you talking crank hp?

Edit: Re-read the first post.

What year 5.3 with what RPO code? Did you search before making your first post or do you deserve a ruler across the knuckles?

If you use the standard 20% loss of horsepower through the drivetrain, then any of the combos putting down about 320 at the rear wheels will give you 400 at the crank. Something like a tr 220 or cam of similar size with headers/ bolt ons should do it pretty easily. Several guys here have put down about 340 at the wheels, or approx 425 at the crank using that combo

I figure i can get around 380 at the crank on my 5.3 Colorado. I just have a ported TB and dynotune at this time, but plan on headers and cam with a E fan later on. It won't be anything like my modded C6 Vette, but around 320hp to the wheels will be much better than stock.

When we talk HP on this site we generally refer to Rear Wheel HP. Few of us have access to engine dynomometers :P

personally i think if you have the newer 5.3 then yes its possible with mininumal mods, maybe not quite 400 but pretty close, older 5.3s i would think it wwould take alot more to achieve

CAI, Long tube headers, off road y-pipe, 220+ cam will get you at least 400 flywheel hp, even on the older 5.3's...

To keep from starting another thread, Ill ask this here. The motor in my truck has 193,000 miles and next weekend we are putting in another 5.3 that only has 43,000. How does wear affect these engines? Can i expect the new one to run stronger?

https://www.performancetrucks.net/fo...d.php?t=462829

All depends on how well the engine has been taken care of. I would rather have a 150,000 mile engine with regular oil changes and regular maintenance by a meticulous owner than one with half as many miles that was beat on and used cheap oil and cheap filters and changed when the owner felt like it.

Ive not had the truck long and im not sure how it was took care of. It runs very strong. I pulled the valve cover on the newer motor and its almost clean enough to eat off of. Not had a chance to look at the older motor. The reason we're changing it is because its going through antifreeze and water like crazy with absolutely no signs of a leak. And we figure we'll just change it due to the high miles.

Im with the rest of these guys 400hp "flywheel" is not too tough man, but if you had an L33 like Trever1t with the upgraded CR and better heads it would take alot less.... Thats why i went with my "Iron" L33 5.3 with 4.8 flat tops and 243 heads to try to squeeze out 400hp with a baby cam and bolt ons. Hope to have this 4.8 out and the new 5.3 soon:drive:

well i have my 5.3 engine with the xr275hr cam, 3000 stall, shorty headers, underdrive pulley, cold air intake, helix spacer, light wieght driveshaft, original tranny, g80 with 342 gears and a custom tune from down south texas, and i am making 456rwhp and my torque was 479... i think it pertty dam good for a 5.3....... i have a couple more mods that i will be adding...

:eek:

...and what size turbo?

nice, so was that with a 125 or 150 shot that your leaving out of this list..?

:rotflmao::funny: Not even a 6.0 with those mods would make that rwhp!

dynograph?


i really gotta see this ;)

i'm barely knocking on 500 to the wheels on a loaded 6.0 :(

yeah those numbers are alil high for a 5.3 without fi or nitrous.

it all depends on how the motor was taken care of , regular oil changes matience ect , .. theres quite a few guys on here with 120k+ miles and have full boltons and cam and run just as good as anything

I've been telling you guys this for too long now, long tubes give up about 110rwhp to SHORTY HEADERS :secret:

What kind of power can be expected from a tr220 cam, lt headers, ory, cai, and 3000 stall?

What year model? 99-06 I'm gunna say about 320-330 RWHP through that converter, and about 400 to 410 at the crank...

I have a tr 220 and its a great cam in a 5.3 I think.. Most tr220 setups make like 325-340 at the rear wheels...

Would it be good to get the whole cam kit with the tr220?

you will need some good springs and pushrods... im runnign pac 1218s and comp 7.4s

Sounds like a lot of you guys are being way too optimistic...


My 5.3 has 400 hp at the crank with a K&N drop in and a flowmaster :eyes: it's got that vortec motor dontchaknow?

https://www.performancetrucks.net/fo....3+tr220+stall

Easy to find with a little search-a-rooskie in the "DYNO" section.

Couple questions...

I have a 2006 5.3 with 128k miles on it.

I'm soon going to be putting a lunati cam into my truck (Voodoo Hydraulic Roller Cam - GM LS GEN III/IV 267/273 - Lunati Power) it has .549 lift on intake and exhaust, and since I have to upgrade my valve springs as well, I'm going ahead and putting new lifters in as well.

all of this with a tune what should I be getting for rear wheel power?

It's 2wd by the way.

Heres my dyno sheet, this is with custom grind cam and springs, long tubes, high flow cats and cold air only. My tuner dude said the stock converter would not stay locked up when he did dyno run. hope this helps.. G.L.

Thanks for the quick reply.

What are the specs on your cam?

If you're going that deep to do lifters, might as well do heads at the same time ol boy. Efficiency.

Gen 4 stock
 

this motor is rated 300hp by Chevy, it has the new 243 heads. a cam, headers, CAI and a tune 400hp easy