LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

5.3 vs 6.0 build

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Old Feb 1, 2020 | 06:38 PM
  #1  
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Car: 87 IROC
Engine: 350
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5.3 vs 6.0 build

First, yes, I've spent hours researching, lol! I'm at the point where I'm ready to step into the 21st century and do an ls. Not going bracket racing, just want a daily driver that'll take 99 percent of whatever is next to me at a red light. So first, single or twin turbos? Leaning towards twins. But since I'm not building a race car, i wanna kind of budget the short block. That being said, goal is as close to 4 digit flywheel power as i can get without spending a fortune on a fully built motor. Thinking 6.0 with good forged pistons and rods will suffice? I've seen all the junkyard boost builds on YouTube. So basically asking who's actually done it, and what where your results?
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Old Feb 2, 2020 | 12:25 AM
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Car: '89 Firebird
Engine: 7.0L
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Re: 5.3 vs 6.0 build

There's only a finite amount of power that street tires will hold on your drive to Wal-Mart. I think it's more about traction, suspension, stall converter & gears, and 60' time than it is about how much power you make.
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Old Feb 2, 2020 | 09:36 AM
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Car: '90 RS
Engine: 377 LSX
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Re: 5.3 vs 6.0 build

1000 hp and cheap dont exist. Once you past 500rwhp on these cars traction is near impossible on street rubber.
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Old Feb 3, 2020 | 08:41 PM
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Re: 5.3 vs 6.0 build

Good price.

https://ls1tech.com/forums/market/1932020
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Old Feb 3, 2020 | 09:02 PM
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Re: 5.3 vs 6.0 build

That IS a good price.
Don't suppose that thing has a 4.125" bore? Cause that and some LS7 heads might work very well.
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Old Feb 3, 2020 | 09:24 PM
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Re: 5.3 vs 6.0 build

I don't know, but maybe could be. A de-stroked LS7 is a 388.
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Old Feb 3, 2020 | 09:34 PM
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Re: 5.3 vs 6.0 build

The web says the 388 has a 4.125" bore....
But the web says a lot of things.
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Old Feb 4, 2020 | 06:53 AM
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Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: 5.3 vs 6.0 build

Stock 5.3 and a s480 turbo and be done. If realllly budget, go vs racing s400 clone for abit less but midwest racing turbo has s480’s for 750-800$.

put a small stage 1-2 turbo cam and thats it


most expensive thing is a 900$ converter and a properly built th400 trans for it. I suppose you could go 4l80e but you dont need overdrive with a 3.00-3.08 gear. Will need 9” or 12 bolt. Put a 275/60 radial under it. Only way to really hook up, but the larger 295-305 17/18/19 wheel drag radials can handle 700-800 whp somewhat
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Old Feb 4, 2020 | 06:55 AM
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Axle/Gears: MWC 9” 3.00
Re: 5.3 vs 6.0 build

You are alocal pa, check out Josh from TotallyBaked powder coating. Bone stock 6.0 with ring gaps and a s484 went 7.90’s in his fox body
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Old Feb 6, 2020 | 07:14 PM
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Re: 5.3 vs 6.0 build

Originally Posted by Orr89RocZ
You are alocal pa, check out Josh from TotallyBaked powder coating. Bone stock 6.0 with ring gaps and a s484 went 7.90’s in his fox body
will do Justin, thanks! I maybe shouldn't divulge this, lol, but my "test vehicle" is not gonna be one of my third gens. Gonna first do a turbo setup in my avalanche, then, whenever i get around to it, transplant it into one of the cars🙂
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Old Feb 9, 2020 | 08:19 PM
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Car: 87 IROC
Engine: 350
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Axle/Gears: 3.23
Re: 5.3 vs 6.0 build

Just out of curiosity, anybody know of anyone that's tried the 1200 dollar twin kit on Amazon? For that price I'm not afraid to take on for the team lol
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