Anyone running 400hp 5.3L?

[iamdub]

Ohhhhhh man you guys are on it.

can I buy the Stock 6.2 and run it without swapping PCM.

My shop has a saying: We will make your car the best it could ever be from the factory.

Mainly for repair, insurance and warranty purposes. I’d love to go 6.2 in the Tahoe too.

Stock for stock, the 6.2 will run on the PCM with the 5.3 tune. It will be FAR from optimal and it won't be happy. But, it'll eventually learn enough to stay running, maybe even well enough to gently drive to the tuner. I'd have the PCM flashed with a 6.2 tune after you pull the 5.3 so it'll be ready and plenty safe to drive to get the fine-tuning handled. Your shop wouldn't be lying since the 6.2 was an option in some GMT900 Tahoes. Nobody has to know it's a 6.2 and it'll look identical to your 5.3 on the outside. If I were buying an engine with a warranty and would be happy with ~400HP, I'd get a 6.2 and not mod it other than a custom tune, mainly for the transmission's benefit.

 

[ls1frc]

Yup my 6.2 looks factory. It came with a harness but existing harness plugged right in. You can check out my build thread in this subforum.

Its not a world beater but the torque in 1st is awesome. Knocks you back hard for a giant vehicle. I recommend keeping VVT. The advance down low makes a big difference.

 

[Nrphlly]

Yeah I’m looking to be at 400hp to not feel the drop off when I drive my cars around. Definitely pulling benefits involved because I haul cars around daily.


Ok so the a Modded 5.3, is still not as good as a Stock 6.2L



This is what it is going in. She will turn the lights out after an engine swap/mod.

Runs Perfectly. Every option except power running boards.

I figure, a 400hp motor and she’s into the next 5yrs. For sure.

 

[Tonyrodz]

Yeah I’m looking to be at 400hp to not feel the drop off when I drive my cars around. Definitely pulling benefits involved because I haul cars around daily.


Ok so the a Modded 5.3, is still not as good as a Stock 6.2L

View attachment 265580

This is what it is going in. She will turn the lights out after an engine swap/mod.

Runs Perfectly. Every option except power running boards.

I figure, a 400hp motor and she’s into the next 5yrs. For sure.

Not trying to be the bearer of bad news, but I'd figure on a trans rebuild in your near future.

 

[iamdub]

Yeah I’m looking to be at 400hp to not feel the drop off when I drive my cars around. Definitely pulling benefits involved because I haul cars around daily.


Ok so the a Modded 5.3, is still not as good as a Stock 6.2L

View attachment 265580

This is what it is going in. She will turn the lights out after an engine swap/mod.

Runs Perfectly. Every option except power running boards.

I figure, a 400hp motor and she’s into the next 5yrs. For sure.

If you're hauling then you definitely should invest in a 6.2, even if stock. In comparison, you'd have to wind out the 5.3 to get moving and it'd be working harder at all times than a 6.2 would. Being a 2012, you already have the 6L80, which is a huge benefit. Get it tuned so it doesn't kill itself.

 

[ls1frc]

6.2, bigger trans cooler, deep trans pan

 

[Tonyv__]

6.2 for the win. I was dying to 6.0 swap my Tahoe. Never got around to it and now own a 15 Denali with the 6.2 Don’t know if I’ll ever go back to a 5.3 lol

if you’re gonna cam and pretty much rebuild your brand new engine. I have a guy in Philly that sells all types of LS engines at a fair price. Just throwing it out there. Disclaimer. I don’t work or make any money off this guy. I just think his place is a gold mine. Just a yard of close to 100 Tahoe’s Yukon’s and pickups

 

[ls1frc]

6.2 for the win. I was dying to 6.0 swap my Tahoe. Never got around to it and now own a 15 Denali with the 6.2 Don’t know if I’ll ever go back to a 5.3 lol

if you’re gonna cam and pretty much rebuild your brand new engine. I have a guy in Philly that sells all types of LS engines at a fair price. Just throwing it out there. Disclaimer. I don’t work or make any money off this guy. I just think his place is a gold mine. Just a yard of close to 100 Tahoe’s Yukon’s and pickups

Where is it. Im near philly too.

 

[Nrphlly]

Yeah I figured I’d be doing a trans soon too. Especially with a motor build. Because I love the truck very much.

 

[Nrphlly]

I will go tomorrow morning and swap the 5.3L for the 6.2L

I’m keeping the vvt and AFM. I have no problems with either system.