Every time i dyno a vehicle i will end it off by seeing what it does at 2000-2500 rpms just curiosity.
The last one was a iron 6.0 with 6.2 rotating assembly and 823 heads and LS3 intake. the crappy part was it had a "sloppy stage 2" cam since everyone thinks they are the best for everything....
It made a whole 318rwhp. And at 2000 rpms it only made 92rwhp/240rwtq. I have to go see what the last stock 4.8 did on the dyno but it was very close to those same numbers.
I've been towing a 6500lb travel trailer around with our 2011 Suburban K1500 with a 5.3/6l80 for years. It is not great, even with 4.10 gears. I found a great deal on a complete running L9H 6.2L from a 2009 Denali and swooped it up. Non-AFM/DOD, VVT, Gen IV Aluminum 6.2L with rectangle port 823 heads and flex fuel injectors. I'm planning on keeping it almost completely stock except for a TSP L92 Stage 1 VVT cam and valvetrain set.
This is the dyno between a stock L99 and the stage 1 cam'ed version. The L92 cam is a bit more truck/low rpm focused than the L99 version they sell now.
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Here's the L92 cam card:
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The difference between the 5.3 and 6.2 is about 100hp/tq just about everywhere.. so i'm looking forward to the difference. It doesn't help that my 5.3 is at ~230k miles, has had slowly decreasing fuel mileage for years, and definitely has something hurt/wrong with it. It isn't bad enough that I've taken the time to hunt down the problem yet though.. so instead I'll just switch to the bigger motor and try to figure out what's wrong with the 5.3 once it is out of the truck.