I'll share my experience since it applies, sort of. My daily driver is a 2008 Sierra regular cab, short bed, two-wheel drive (much heavier than a G Body). It has a 5.3. I have the LS Hot Cam (219/228 525/525 112) in it. It has the 4L70E transmission. I'm running a Circle D 3400 Stall converter with 4.10 gears. At first, this setup might seem a little extreme for the street (very subjective), but I find it quite streetable. Keep in mind, my 275/55/20 tires on the truck are nearly 32" tall, so that makes the 4.10 rear gear far less extreme. As far as the converter, when I first put the combo together, I thought I had made a bad mistake. It seemed incredibly loose, but ultimately how it acts is all in the tune. I went with Circle D's recommendation and I think it is completely streetable and well matched to the cam.
As far as the Hot Cam goes, I love how it sounds. It has that great choppy idle sound. Under 2500 RPM, it's asleep. 3000 RPM and higher, it's awesome. I put the cam in with 82k miles on the clock. Now it has 170k miles. I really like that it is a GM cam and matching GM springs. I like that the .525 lift and lobe profile aren't very aggressive which in my mind makes it a durable setup. In the summer, running the A/C in rush hour traffic, it's really on the verge of having too much overlap. The idle with hot underhood temps and the load of the A/C compressor on it is a little rough for my liking. We have the same cam in my brother's 6.0 in his 78 Z28, backed by a T56 magnum. I like the cam better in his car. With my automatic transmission and smaller 5.3, and with all the traffic I drive in, every day, if I had it to do over again, I would put in something different. When I bought the Hot Cam for my truck and for my brother's car, I had some buddies at a local GM Dealership and they sold me parts at their price so I got a great deal on both cams.
If you had a 6.0 and a manual transmission, I'd tell you to go for it on the LS Hot Cam. With an automatic and a 5.3, I think you should shop some more. I'm not familiar with the cams Mike mentioned above (Summit) but I've read enough of his posts to be able to tell you, he knows what he is talking about. It's been 6 years since I shopped for a cam for an LS so I can't tell you what cam to go for. When I initially read your post, I thought of the LS6 cam 204/218 550/550 117.5 but it might be a little too mild mannered for you, I'm not sure. With that much wider LSA it won't have the chop like the Hot Cam. It looks a little pricey so you might be able to find something better off the shelf.
Does your engine have cathedral port heads? Mine (LMG - Gen IV) does and so does my brother's (LM7 - Gen III). Did 5.3's ever get the LS3/L99 style rectangle port heads?
These look intriguing. Made in the USA. Way to go Mike!
https://www.summitracing.com/search...ck-swap-camshafts?autoview=SKU&ibanner=SREPD5
I like this one...
https://www.summitracing.com/parts/sum-8719/overview/
