Yes you will need to replace the cam. The lobe profiles are different.

 

Ok I was questioning it as well because the dfm system has all 16 lifters with the spring style vs the older afm with just the 8. So I wasn’t sure if the cam mattered on the L84 motors.

 

In the older truck I am not aware of them having to swap the cam. Have you talked with the folks who supplied the kit? I have heard "Texas Speed" mentioned often when guys do the delete with very positive reviews. Maybe reach out to them.

Texas Speed and Performance

Texas Speed & Performance is your one-stop shop for all LS and Gen 5 LT1 & LT4 performance parts and engines! We are among the largest LS and Gen 5 LT1/LT4-specific shops in the country, and we machine and assemble all of our engines, camshafts, and Precision Race Components cylinder heads in...

www.texas-speed.com

 

I believe your supposed to swap the cam not sure on the t1xx platform with the dfm

 

On the L87 running DFM you do not have to replace the cam unless it is damaged. All the lobes are ground the same unlike AFM. Replace collapsible lifters with Ls7 style, stock cam, flash disable DFM and deleted and plugged solenoids. You will retain stock parameters with no cylinder deactivation. Ask any GM Performace shop that installs Whipple or Magnuson Superchargers. They simply deactivate DFM and leave the stock lifters in the valve train. They can accomplish this only because the camshaft is ground the same on all eight cylinders. Now if you are looking for high performance you can change the cam to different variants to aquire higher hp, but then VVT comes into play with phaser limiters or lockouts along with valve train upgrades. I myself run the stock cam with Ls7 style lifters with DFM flash disabled via unlocked ECM. Tuning is all stock. Much more reliable setup for me as I'm not looking to be the fastest on the street.
2019 GMC Sierra 1500 6.2 (103k and going strong)

 

I have a 2021 GMC 5.3 the chip is not in it to activate the DFM. Can I use the stock cam on it with LS7 lifters and delete and plug the solenoids? Or will it not run okay. I keep reading the ramps are different for the collapsible lifters, but not sure if they are not just trying to sell cams. It runs great with this cam and I get 24 MPG in v8 mode. I just want to get rid of the failure parts. If you are having good luck with the L87 I am not sure why it would not work on the 5.3. But I don't want to build it twice. Thank you for any help.

 

Hey all I’m in the middle of doing the DFM delete on my 2019 Trailboss
5.3 L84 engine.

I’m having trouble getting the right answer wether or not I need to replace the cam in this one with the non DOD cam or am I ok to keep the stock cam with the replacement lifters in the delete kit??

If you are just deleting and not chasing high hp you can run the stock cam as long as your ECM is unlocked and DFM is flashed OFF.

 

Trail Boss Guy, did you keep the stock cam or replace on the dfm delete 5.3 L84. I am also getting conflicting information on this subject

 

On the L87 running DFM you do not have to replace the cam unless it is damaged. All the lobes are ground the same unlike AFM. Replace collapsible lifters with Ls7 style, stock cam, flash disable DFM and deleted and plugged solenoids. You will retain stock parameters with no cylinder deactivation. Ask any GM Performace shop that installs Whipple or Magnuson Superchargers. They simply deactivate DFM and leave the stock lifters in the valve train. They can accomplish this only because the camshaft is ground the same on all eight cylinders. Now if you are looking for high performance you can change the cam to different variants to aquire higher hp, but then VVT comes into play with phaser limiters or lockouts along with valve train upgrades. I myself run the stock cam with Ls7 style lifters with DFM flash disabled via unlocked ECM. Tuning is all stock. Much more reliable setup for me as I'm not looking to be the fastest on the street. 2019 GMC Sierra 1500 6.2 (103k and going strong)

Would this be the same on an l84 5.3l?

 

If you have had issues with the lifters ticking, or if your having trouble with a miss at certain RPM ranges as I am having, I would suggest considering wether the Camshaft could possibly be damaged. I am not going to take a chance with a possibility damaged Camshaft. The delete kit I’ve been looking at has everything including Camshaft, lifters, bolts, head gaskets, etc. I am not ready to jump into the delete yet, but I will eventually have to. Thanks for your input. Brett

 

What are you guys doing for the temperature sensor since the connector for it is a part of of small harness for the cylinder deactivation solenoids on the 2019 5.3

 

I went thru this recently, and everyone seemingly "in the know" said to put a new cam in it. So I put a delete cam with OEM profile in it, no tuning required.