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Old August 28th, 2010, 09:38 PM   #1
Haggar
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Default How much HP from a 5.3?

Possible to get 450 hp out of a 5.3 vortec, without resorting to major work?

More specifically, an L33 high output motor?

I know that 5.3s, with headers, intake, tune, LS6 intake and heads have been close to 400..

The L33 has LS6 heads, and 10:1 compression(normal 5.3s have worse heads an ~9.4:1 compression), wondering what would be an expected ballpark hp number with those types of mods -> intake, exhaust, headers, cam, tune.
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Old August 28th, 2010, 10:39 PM   #2
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Ya, it's possible but you probably won't like the power curve. If you went with cnc ported heads and a cleaned up intake manifold and 90mm TB you could get there with a slight bump in CR and it'd give you a streetable power curve. If you stuck to 400 or so you'd be able to have a nice power curve and not get into any head work and you'd keep some low end grunt.

If you go with over .600" of lift you can do a lot with a stock long block but you do have to give up something.

Check around on ls1tech and see what some people have done, it should give you a pretty good ballpark. If you want good street manners then stay below the upper 220s for duration and depending on idle quality, 114+ lsa. Your lift and ramp rates will determine how much power you will make from that ballpark starting point.
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Old August 28th, 2010, 10:40 PM   #3
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Bolt on a supercharger?
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Old August 28th, 2010, 11:13 PM   #4
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How much do you want to spend? Call Rick at Trick Performance and he can set you up with a t70 turbo kit that makes 550rwhp for $2000.

http://www.trickperformanceproducts....rbo_stage1.htm

Or for a little more money and less HP you can go the with a LS2 style build with a 5.3 like the link below.

http://www.pro-touring.com/forum/showthread.php?t=56501



My current setup is a 5.3, texas speed 220 cam, Stainless works LT's, nelson tune, trick performance E fans and a digital Wet NOS kit 150 shot. Im in the mid 400's now and its alright, but after talking to a few turbo guys, Im looking at either selling my Long Tubes and going with the Trick kit, or keeping them and going with a custom remote turbo kit.

This winter will tell whats to come.

Truthfully the $2000 trick kit is by far the best price for over 550hp, but you still have to have a tune and an upgrade fuel system. All can be done for under $1000 going to a return style fuel system and a dual pump setup with 42lb injectors.
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Old August 29th, 2010, 01:17 AM   #5
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I have a Cam you might be interested in If you build the 5.3. It's a Texas Speed MS4 I bought for my Trans-Am but since being layed off don't have the cash to do the build. I paid $375 Plus shipping a month ago. I'll take $300 for it +shipping if you want it shipped. You can see the info on the cam here.
http://texas-speed.com/shop/item.asp...d=666&catid=44

PM me if you are interested
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Old August 29th, 2010, 01:17 PM   #6
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My personal opinion is that remote turbo kits are booty fab. They should be the last option when it comes to making big power.

If there's anyone out there that wants custom headers and plumbing made for a turbo application I might know someone who can make it happen for an affordable amount.
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Old August 29th, 2010, 06:17 PM   #7
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My original question, is because I've been thinking of building a sand jeep. I have a nice L33 motor, trying to determine if this would be enough motor, or if I should go with something like a old style carbed 383 stroker....
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Old August 29th, 2010, 06:38 PM   #8
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I would think that would be plenty of motor. Especially if you do a cam and the ls6 heads and intake. Depending on the cam you would be in the 400 - 420 range at the crank. Plus fuel injection is so nice. sucks stalling out on a hill.
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Old August 29th, 2010, 07:45 PM   #9
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stay with the fuel injection, 500 hp on these is easy. Ls engines are easy to modify and make good power with, best thing is that if you want more they can handle it stock. rather then build a good 383 that costs 4k to build correctly, get your 5.3 heads ported, milled.

then if you dont mind a bad idle go with that Magic Sick 4 cam its a good cam just have to make sure of you piston to valve clearance.

Last edited by projecthellraiser; August 29th, 2010 at 09:34 PM.
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Old August 29th, 2010, 08:08 PM   #10
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Its an L33, which means its already got LS6 heads and 4.8l pistons from the factory..
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Old August 29th, 2010, 09:33 PM   #11
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I talked to my cusin who builds engines for a living and he said a stage 2 or 2.5 port on those heads will bring you over 400 crank hp. so send the heads out to be ported or get a hold of a vendor on Ls1 tech and get you and modified set to swap cores for.
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Old August 29th, 2010, 09:38 PM   #12
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If it's going to be a "mostly" strict sand jeep then you can run a 32-3400 rpm converter and a pretty big cam and not really notice any loss on the low end. Big cam, other supporting mods and a 150 shot and you'll be plenty happy with it. Having a trans that can put down 100% of the power is very critical also. If you cover all your bases then a 383 will take a BIG stretch to get on the same page as a cam and tune 5.3L.

Benny87 has a medium sized cam in his 5.3 and it's probably in the 380 range and he's happy with it. He should have a dyno sheet soon.
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Old August 29th, 2010, 09:42 PM   #13
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Quote:
Originally Posted by projecthellraiser View Post
I talked to my cusin who builds engines for a living and he said a stage 2 or 2.5 port on those heads will bring you over 400 crank hp. so send the heads out to be ported or get a hold of a vendor on Ls1 tech and get you and modified set to swap cores for.
Go look at the flow numbers for stock castings vs "stage 68.45832" heads. They aren't that much different and this is a small displacement engine when it comes down to it. Just a cam on that engine will get him into the 400 crank hp range. Cnc ported heads are a waste for him unless he's looking for the last 5% that's available.
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Old August 29th, 2010, 11:43 PM   #14
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If you mill the heads the MS4 will cause piston to valve clearance problems. At least on the LS1 it will, not 100% about on the 5.3
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Old May 29th, 2013, 11:03 PM   #15
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bringing back up an old thread. Just curious if anyone has done anymore 5.3L builds. If so what have you done and how do you like it.
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Old May 30th, 2013, 02:20 PM   #16
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Best thing is to spend some time on the ls1forum.com site, and look at builds there...
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Old May 31st, 2013, 11:06 AM   #17
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Buddy just built a 6.0 fully forged with turbo 650 at the wheels. He was at the dunes memorial day burgandy 2002 silverado
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Old June 11th, 2013, 10:21 AM   #18
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http://ls1tech.com/forums/dynamomete...-cam-only.html
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Old June 11th, 2013, 01:16 PM   #19
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Quote:
Originally Posted by dudekcj7 View Post
Buddy just built a 6.0 fully forged with turbo 650 at the wheels. He was at the dunes memorial day burgandy 2002 silverado
Other than bragging about your buddies motor, this is irrelevent to the thread...
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Old June 12th, 2013, 11:08 PM   #20
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Been beating mine for a year now.bent a rod.hold it on the rev limiter all the time.I would not recommend anything more then a tune, camaro manifolds or good headers and beat it.
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