Obviously it's best if you check (you'd need to be able to manually test it in both retard and advanced positions). Usually the duration is more critical than the valve lift because of the effect on the opening of the valves relative to the piston position. But neither the duration or the lift are much of an increase over the stock 5.3L cam, so probably ok with the factory compressed thickness head gasket.

 

You could use your stock valve springs (the 6.2 trucks don't use special springs) and leave the phaser alone. You already have reliefs in the pistons on your 5.3 and the 6.2 cam won't be moving anymore than the 5.3 cam did lol. The lift and duration change are insignificant.

 

Thanks for the info. I've already bought LS6 springs so I'm going to go ahead with changing them out anyways. I'll be doing the swap this weekend.

 

Let us know how she feels once you get her tuned.

 

I got the heads pulled off last night. Lots a carbon buildup on the pistons, started trying to clean it out with carb cleaner. Going to clean heads and swap valve springs today. Then I'll start working on dropping the front diff so I can get the oil pan off to block the pressure relief valve in the oil pan. I'm definitely under the gun since we need to take this vehicle in a long road trip on Thursday. Hopefully the tune is close since the cam will only be a slight change. I have Efilive and a wideband but not much time.

 

Actually it'll be interesting to learn the seat-of-the-pants difference as a mostly drop-in condition. And again later with fine-tuning of the cam position tables across the load/rpm range. I'm looking forward to the results. Please keep us informed.

 

How do I manually check the retard and advance of the phaser?

*update* yesterday I got heads and pistons cleaned up, pulled timing cover and oil pump and swapped cams. Tonight I'm going to do valvesprings because I didn't get to them yesterday. I've also decided to leave the oil pressure relief valve in the oil pan for now because I don't have much time before my cross country trip. I intend on replacing the valve later on. I inspected all the valvetrain and it all looks good. I found OEM plugs on all but cylinder 7 which had an aftermarket AC delco plug (possibly related to previous owner cyl 7 misfire?).

I shoved a borescope to the back of the oil pan to inspect the high pressure oil relief valve. I'll attach pictures in another post. Perhaps someone can advise from the pics if it looks like the oil pressure valve shrowd is installed as directed in the TSB

 

Not sure why it looks like there's two valves??? That can't be...

Doesn't look live the valve has a shrowd either.

 

I'm not sure if there's a way to do it without the tool: https://www.enginelabs.com/news/vide...iston-to-valve. So you probably won't have time now with your schedule.

But if you did, you would just need to verify the PTV of a respective valve worst case depending on if it's advanced or retarded (not both valves both advanced and retarded).

• Advancing decreases intake PTV clearance
• Retarding decreases exhaust PTV clearance

 

Update:

It's been a while since I last posted. I completed the cam swap but decided to not take it on the long trip because the fuel trims were too far out. I had LTFTs running about -8 at light throttle conditions. Working on getting my calc_pids file correct so I can start tuning VE. Seems to run and drive like stock, i've only driven it at light throttle so far.