T/A Addict

I have an 07 Avalanche with a 5.3 that is family used regularly to haul the boat, camping and vacation that is in need of a motor and trans swap soon so wanting to look at options. I've considered just sending it out to be done with a stock replacement motor but that seems to be crazy expensive really.
option 1: I do have a fresh 04 4.8 long block that I bought to do a build on my 69 Firebird... can the 4.8 be installed using all accessories from the 5.3 without any issues?
option 2: Maybe I can grab a low mileage 5.3 that someone is selling and install it. If so what years or things do I need to watch for to keep from having any issues with the PCM etc.
option 3: Pull and rebuild the existing 5.3 (bore to a 5.7 maybe) this of course would be the more time consuming option and I really don't want the truck down for long.

Any other options or input from anybody? Trying to keep cost to a minimum since I have plenty of other projects that need time and money too.

tech@WS6store

iTrader: (2)

Build your 5.3 into a 5.7 for very little and have a band new engine to work with.
Our Complete rebuild kit $699
About $400-600 in machine work
Dod delete $300
Vvt delete (if applicable) $99
Small tow cam with springs $500

Done. Decent budget, much better power, better mpg, and reliable for another 200k miles.
Downgrading to a 4.8l would be a bad idea. And used motors you can get a bad setup very quickly or have a smoker etc etc.

Just an option for you to mull over!

matts01z71

Don't do the 4.8 for the Av. I bought a JY 5.3 for my 03 tahoe, rebuilt it, added a TSP 212/218 cam, some shorties and a Magnaflow. Tows the boat just fine with 342s. Neighbor wants the 5.3 for his K5 blazer project. I wouldn't trust any unknown engine to be any better than what you have.

T/A Addict

Thanks guys, I'll definitely look to do the 5.7. I'll probably start looking for a complete tired 5.3 that I can use to rebuild so downtime on the truck is minimal.

T/A Addict

What year 5.3 are interchangeable with my 07 5.3?

Underachieved

LY5-Introduced in 2007, the Vortec 5300 LY5 (VIN code "J") is the replacement for the LM7 Generation III engine. For SUV applications, it is rated at 320 hp (239 kW) and 340 lb⋅ft (461 N⋅m) of torque; for pickup truck applications, it is rated at 315–320 hp (235–239 kW) at 5200 rpm and 335–340 lb⋅ft (454–461 N⋅m) at 4000 rpm
LY5 applications: 2007-2014

LMG-The Vortec 5300 LMG (VIN code "0") is the flex fuel version of the LY5. Power and torque ratings for SUV and pickup truck applications are the same as each application's LY5 rating. Variable valve timing was added for the 2010 model year.
LMG applications:2007–2013


Assume GenIV
LC9-The Vortec 5300 LC9 (VIN code "7”) is the aluminum block Flex-Fuel version of the LH6, and is found in 4WD models. SUV applications are rated at 320 hp (239 kW) @ 5400 rpm and 335 lb⋅ft (454 N⋅m) @ 4000 rpm of torque. Pickup truck applications are rated at 315 hp (235 kW) @ 5300 rpm and 335 lb⋅ft (454 N⋅m) @ 4000 rpm of torque. Variable valve timing was added for the 2010 model year.
LC9 applications:2007–2013

T/A Addict

ok looked up the vin... it is a "3" correct me if I'm wrong but that is an aluminum block LC9?

Underachieved

https://help.summitracing.com/app/an...-engine-by-vin

dawgs74

if he did vvt delete can he still use a hi volume oil pump?

tech@WS6store

iTrader: (2)

There is no need for the extra volume then.
Most "solely" vvt engines use a std gm pump. the afm engines and afm/vvt engines use high volume. and some vvt only use high volume so its a crap shoot really.

But deleting that stuff negates the need for extra volume period so a std volume pump should be used.

dawgs74

Ok makes sense.....so I'm in the same boat kinda...I gotta l96 that I removed the vvt and installed an asa cam, is it OK to still use a hi volume pump even though I'm not using vvt any longer? Plus I already have the hi volume melling pump in my pile of parts....I put the cheap $39 standard pump on my flat top 5.3 and it gets about 45psi at temp.....I was saving the $150 hi volume oil pump for my 11.25:1 lq9 370.....but I just might put it in this l96 if it wont hurt anything !!!! Or should I just order another $39 standard pressure/volume pump?

tech@WS6store

iTrader: (2)

Using a high volume pump on a build that does not need it will agitate pcv and oil consumption issues greatly.
Melling 10295 for everything if you are looking at a performance pump.

dawgs74

Will this work on my l96 with vvt delete and asa cam? Or if not will it work on an gen3 lq9 ? Any help would be greatly appreciated -----TRENT

tech@WS6store

iTrader: (2)

The HV means its a high volume. i would not use it at all.