guessing the NPT is to tighten a jamb nut on the back side with some high-temp sealant on the hole/threads. welding an AN fitting is another option.
a barb fitting with a tight clamp should be fine for a gravity drain or even light pressure without leaking... but obviously something screwed on would be much more secure.

as for 'ridiculous torque surges' overwhelming the vehicle's electronic nannies, clutch, tires, lateral stability, etc. (which i'd argue is more of a factor in a pickup with less weight on the rear) - that's where driver skill plays a big role with regard to those throttle positions between 0% and 100% one of the 1st lessons i got from an HPDE instructor was an A:B comparison on how much lapping with the TC on holds you back & you're better off & faster around by learning to drive safely with the system off (granted, i can only speak to how that applies on cars from 20yrs ago) - point being you can't just floor it coming out corners on ANY high-power vehicle (except maybe a Koenigsegg).

the bits above on the truck manifold differences sound correct, to the best of my recollection (with a couple exceptions like the Hummer, Colorado, Canyon, and maybe one more special application).

 

This thread is about an SUV last I checked lmao

Weld it. Pay a welder to weld it. Welds are leak free, when done by a competent welder. Aluminum oil pans are not a project to learn to weld either

I charge $40/bung, I imagine shops in your area will be similar. You'll spend 2x that much on a drill, tap, tapping guide and time to cuss at it and discover you need to tap it deeper anyway

 

oh, being under 5300lb, i figured he was talking about a Sierra Denali (considering my RCSB was ~4800lb with nothing in it)

 

Well shoot, you might be right then!

 

The GM weight is supposedly just under 5400. It seems light to me as well considering the GMT900s I think had like over 400 lbs on the 800s. I am missing a few things from mine including the space and jacking equipment.

I wonder how much cleanup the secondary big cat would do to the exhaust? Say if I didn't try to put the primary cats back in and routed the turbo exhaust to the secondary cat if it would do anything. I know on my Camaro I took the primary cats off and the secondary ones did absolutely nothing to help the unburnt fuel smell.

 

Smelling "unburnt" fuel is a tune issue, imo

 

No cats you are always going to have that stench. Not so much unburnt fuel but it will always stink

 

Yeah its not really unburnt fuel smell, I just didn't have another word to call it, but its the smell you get when you don't have cats. I don't think the secondary cat will be of any use. I think it is there for additional NOX control and 99.9% of the unburnt hydrocarbons are taken care of in the primary cat.

Unfortunately my morale is dwindling for this truck. My main goal seems like it should be trying to find a better place to work on stuff and try to get a lift. My hands are also going numb anytime I use them and turn screws and wrenches as well.

I still would want to at least do a cam which shouldn't technically cost that much if I don't do an aggressive one, but I have been looking all over for LS3/L92 head cross sectional areas and intake manifold runner lengths and taper but I can't find anything. I can find it for the GEN V stuff since the Corvette team did a presentation on it but I haven't had any luck on the GEN IV stuff. I want to use the info so I can simulate some different cam grinds.

I really appreciate everyone's insight and help however, I've learned quite a bit from these forums and fortunately its one of the better ones and not filled with useless tech that assumes taking off the negative battery cable resets all the computers and fixes everything.

 

I can't help you with taper, but I have read several places that the square port truck mani's are 17" runners, I'll see what I can dig up next time I am on Google

 

Thanks! I've been looking for this forever. I would just measure it but that's harder than it looks.

I think that 17in number probably includes the intake port length as well? The measurement I got for my GEN V intake manifold was about 12 inches.