i think i know how this will be answered, but i figured i should ask folks smarter than myself:

are a stock LQ9 (or LQ4) and a stock LM7 running similar-enough fuel maps that if someone was to hypothetically buy a cheap craigslist Escalade (or Denali / HD truck), swap the short blocks & injectors with his 5.3 truck, and re-sell the Escalade (morally noting that the engine had been replaced) - all without spending the money to retune the Caddy (because that'd negate the cost savings)... would the Escalade still run as good as one should expect from a sub-$3000 truck: well-enough to pass emissions & not throw CELs?

i reckon the closest-to-yes answer would be if the long blocks swapped... but doubtful if swapping the 5.3's 862s & cam to the 6.0 because it'd be running the LQx cam in a 5.3 with the lower-compression 317 heads to boot.

Just curious...

 

and looking at the math, it appears a 5.3 with 317 heads & LQ9 cam would make for about 8.55 SCR & 8.09 DCR.

... which initially sounds like by that point, i'd need to add a big turbo & fuel pump to make the Escalade worth a darn, definitely tune it, and dream of passing those costs to the sales price... or just pay a grand for a decent short block out right.

is that about the way it plays out in y'all's minds?

 

correction from more-accurate CR calc inputs... the 5.3 would have 8.42 SCR, yielding 7.97 DCR. even more of a pig in a 3ton truck without the boost.

 

The injectors are the same in the LQ4/9 trucks and the 5.3's. The fueling is going to be a big swing between the two engines and will need the fuel maps tuned. The 862/706 heads are cheap and plentiful so it may be best and easiest to let those 862's stay with the 5.3 swap. This would be a good time to invest in the MPVI2 and some credits lol.

 

wait... the LM7 & LQ9 have the same injectors? i figured it'd at least use the bigger ones from the L59 (flex fuel 5.3) but thought they were even bigger than those. guess i was way out to lunch.
in that case, disregard all. and it's hard to justify starting my tuning costs all over again, when Justin (BlackBear)'s been doing a great job on this truck for the last 10yrs.
and buying another set of heads just makes for another thing to try & sell later... and my garage is racking up unsold parts.

 

L59 Flex Fuel injectors are larger than the standard truck injectors. They also have a different plug on them Verses the standard truck injectors

 

Those flex would be much better injectors for the LQ4/9 but he's still looking at changing the injector data in the tune. If I understand correctly he's wanting to swap a 5.3 out to a 6.0 and run it on the BlackBear 5.3 tune. Heck you can't (can but shouldn't) change out the oem air box to a cold air intake without re-scaling the MAF curve.

 

I read blackbear and good job in the same thread as cheaping out to get a 6.0 and I'm wondering how much beer _zebra has had in lockdown 😂

truth be told, if you really wanted you could put a bone stock 5.3 in there and it would run and most ppl would be none the wiser

you should get your 6.0 swap tuned however. And I absolutely wouldn't swap 317s to a 5.3: ever. Boost or not

 

no, i'd MOST DEFINITELY get my truck retuned!
shoot... adding 30ci + bumping a point & a half of compression on my DD that trailers my track car. dern tootin', i'm getting that junk redid.

i'm asking about passably running a point-lower compression LM7 in the Escalade with the LQ9 cam on the stock LQ9 tune (using the LM7 injectors).

and i ordered a case of Dickel #12 handles a couple weeks ago... one's almost half gone. got the leak in my worm box fixed last weekend, but the grocery store was somehow out of yeast... so replenishing my own supply is on hold.

but for real, though, Justin actually nailed my original 5.3 swap on a basic bench tune, whereas Jesse (W4M) took 3 shots & still didn't have it running right - blaming me for everything under the sun. i later upgraded to Justin's scan tune on 93 & have done a couple updates since (33s, gears, cam, etc). all've driven pretty good (the cam took a couple reflashes to smooth out the low-speed bucking with the clutch out... but still turned out great).

not even for a 1/2 mi truck eating from a big S400?

 

Not even for a 1/2mi truck