I need a little advice. I have a 5.3 out of a 2006 truck of some sort with 60k on it. It's not complete, i need front cover, some accessories, brackets, harness and ecu. I have part of a harness that came with it but it's hacked up. It needs a cam and lifters which I'd want to do regardless.

I may have a change to get a totally complete 6.0 with 170k out of an 01 truck of some sort really cheap. It's in a yukon denali. would it be the LQ9?

This would be going in a 71 a-body convertible with as yet undetermined trans, t56 or 4L80 and probably 3.73 gears. I want a nice reliable, quick street car.

I know the 06 5.3 is better than the earlier ones and this one is pretty low miles, but, is there any reason I should use the 5.3 instead of the 6.0? I have to pay body and paint work on the car so budget is important. If the 6 looks good I'll buy it anyway tho.

Thanks

 

If this has such low miles...why is it that far apart...???

It's good you already own it...but it sounds a little sketchy.


Bang for the buck , the complete 6.0L is your huckleberry...it's all there, (the little stuff ads up to complete your 5.3) plus the extra cubes are an added bonus...

 

The 5.3 was a warranty replacement at a dealer because of a lifter roller that went south and damaged the cam. They apparently robbed parts to put on the replacement. It doesn't matter at this point as the jerk sold the 6 out from under me. I'm not in a hurry so I may find another.

 

6.0 in my opinion. More cubic inches. Bigger bore. More horsepower... JMO.

 

Forgot to say if it's out of a Denali it's probably an LQ4...

 

Do you have a horsepower goal ?

 

I'd go for the 6.0 it will be an lq4. More cubes=more power

 

Not really, just not to be embarrassed by a mustang.

 

I'll do the 6.0! You are building the motor to a performance motor right? If that the case, half of it would have new parts!

 

I've had that happen...If you have time, hold out for the 6.0.


Or...do what I did with my A-body...I decided to install a 5.3 to get all the details of the swap ironed out...with the bonus of being able to drive it sooner than later.

I have my 6.0 on the engine stand now, and am building a forged bottom end as my budget allows...

 

I'll go 6.0 with some goodies.... cam, headers , tune, etc.

It don't take much to crack the 420 horse mark at the crank with a 6.0.

http://www.hotrod.com/how-
to/engine/hrdp-0710-6l-ls-series-small-block/
READING THAT ARTICLE IS VERY HELPFUL.

 

The only way I'd use a 5.3 is if it was going to be installed with a turbo at the same time. If you are staying all motor or doing nitrous, then definitely 6.0. If you want to boost it but will be N/A for a while and doing the FI later down the line, still go 6.0 so you have more N/A power to play with for the time being, and when you do go FI it'll take less boost to make the same power vs a 5.3. 6.0 FTW.

 

I vote the 6.0L. Even if it's an LQ4, it will still have a better power output than the 5.3L with the right modifications.

 

Thanks for all of the comments, I have some things to think about.