Well I think a lifter left the chat

MrMonte · Mar 18, 2026

Chris2144 said:
lol yea I don’t think the wife needs that much horsepower.

I was on btr and they have a whole kit. Right about 500.
Ls7 lifters, lifter trays, head gaskets, and head bolts.
I think I’m gonna go ahead and order that.
I’ll try and get a video uploaded of the noise later this evening my signal suck where I’m at right now.

I figure after fluids and whatnot I’ll have about 700 in it.

I’m way to far in it to turn it loose now and it seems to run pretty good and gets 19mpg so I guess I’ll just keep fixing it.

Anyone have any experience with btr ls7 lifters I have heard they are good quality

I would only use ACDELCO LS7 lifters from what I've read. I did my AFM delete over 50K miles ago using ACDELCO LS7 lifters & LS2 trays. Aftermarket trays can be sloppy & cause lifters to fail.

I just got back from 1,100 mile roadtrip with over 4,000ft elevation changes, saw some rain, snow, high winds + 80 mph speed limits and still got 22mpg in my 2018 Yukon Denali with 135K miles, 33" 305 wide tires & 16.2" 6 piston Brembo brakes. I went with the Scoggin Dickey non-AFM cam and was able to replace the cam without dropping the oil pan or pulling the engine.

Chris2144 · Mar 18, 2026

So I just bought some parts.
Brain tooley racing Delphi ls7 lifters
Lifter trays
Ls3 5 layer head gaskets
New head bolts.

I will see how the cam and pushrods look once I have it torn apart. I’m hoping I don’t have to spend anymore money on it things are kinda tight right now but if I need a new cam and push rods I’ll order those as well. Being this doesn’t have afm I don’t have to put a cam in unless this one is damaged.

Just had to do a new roof on the house and having a new ac put in the house too then this happens. Just my kind of luck.

Chris2144 · Mar 18, 2026

mikez71 said:
Good! I was probably hearing the exhaust noise, amplified thru my phone speaker..

Why does lifter noise reduce when engine warms up? And why no miss when warm? Collapsed lifter pumps up better warm?

That’s what it sounds like is going on.
I know the lifters can spin in the tray and skip across the cam or they can stick and the cam just smacks them all the time.
They can also get weak and be collapsed on start up which is what I think is going on in my case. Once they pump up then the noise gets quieter and it stops misfiring.

Either way though they are all getting replaced and hopefully it didn’t wipe out the cam and pushrods too.

07burban88 · Mar 23, 2026

buckwild27 said:
For a small fee I can fix you up there too no stupid lifter issues with this beast. View attachment 480702 View attachment 480703

I want this much power and beast. I don't need it but I WANT it. how much we talkin?

buckwild27 · Mar 23, 2026

$18,000 for the whole truck. You're basically buying the guts and getting a beat up wrapper for free.

buckwild27 · Mar 23, 2026

MrMonte said:
I would only use ACDELCO LS7 lifters from what I've read. I did my AFM delete over 50K miles ago using ACDELCO LS7 lifters & LS2 trays. Aftermarket trays can be sloppy & cause lifters to fail.

I just got back from 1,100 mile roadtrip with over 4,000ft elevation changes, saw some rain, snow, high winds + 80 mph speed limits and still got 22mpg in my 2018 Yukon Denali with 135K miles, 33" 305 wide tires & 16.2" 6 piston Brembo brakes. I went with the Scoggin Dickey non-AFM cam and was able to replace the cam without dropping the oil pan or pulling the engine.View attachment 480729

Did you physically do the math? Or are you completely relying on the girl math the vehicle does. Most generally that's 2 different numbers

MrMonte · Mar 24, 2026

buckwild27 said:
Did you physically do the math? Or are you completely relying on the girl math the vehicle does. Most generally that's 2 different numbers

After doing the speedo correction using GPS over 36K miles ago I compared actual calculated mpg vs what is displayed and the numbers were within .1mpg each time I checked.

buckwild27 · Mar 24, 2026

MrMonte said:
After doing the speedo correction using GPS over 36K miles ago I compared actual calculated mpg vs what is displayed and the numbers were within .1mpg each time I checked.

That's good news.

hagar · Mar 24, 2026

buckwild27 said:
You don't think she would enjoy 800hp?

You're not making 800 hp with that wagon wheel of a supercharger pulley. Lol

Lalo · Mar 24, 2026

I did a whole AFM delete on my 2015 Yukon Denali with the L86 6.2, I got the kit from BTR with their LS7 lifters and cam about $1500 in parts all together ran about 80 miles then one of the new lifters took a crap, replaced the lifters with Melling brand non-AFM lifters and ran great until I traded the truck in a few thousand miles later, If I had to do it again would have bought the name brand lifters, Melling, AC Delco etc .....

buckwild27 · Mar 24, 2026

hagar said:
You're not making 800 hp with that wagon wheel of a supercharger pulley. Lol

Thank you for your eyeball dyno run. I guess it really is true sometimes you get what you pay for. It's a good thing i didn't pay you for the multiple dyno runs, multiple pulleys, and a few sets of injectors. And spent every ounce of my free time building the damn truck when I could have just come here to get your free insight. When you have no idea what's gone into everything in that picture other than a procharger that I'm going to guess you don't even know the size of. Ok real man of genius. Tell me how much hp I'm making. I'll stop wasting money on dyno runs now that I have you to tell me what I'm making for hp numbers.

hagar · Mar 24, 2026

buckwild27 said:
Thank you for your eyeball dyno run. I guess it really is true sometimes you get what you pay for. It's a good thing i didn't pay you for the multiple dyno runs, multiple pulleys, and a few sets of injectors. And spent every ounce of my free time building the damn truck when I could have just come here to get your free insight. When you have no idea what's gone into everything in that picture other than a procharger that I'm going to guess you don't even know the size of. Ok real man of genius. Tell me how much hp I'm making. I'll stop wasting money on dyno runs now that I have you to tell me what I'm making for hp numbers. View attachment 481093 View attachment 481094 View attachment 481095

I zoomed in to see which head unit it is before commenting and its a D1sc. Even if it has a 20 percent overdrive lower, that is one massive charger pulley to be making 800 hp!
All of the D1 cars i have ever built, take way more boost than that is pullied for to make 800 hp.
What is that pulley size and what is your lower pulley size? Don't even need a dyno graph to know the power something has the potential of making when it is a fixed drive pulley ratio that makes a known cfm at said ratio and rpm.

Looks like a 5 inch upper from here.

Too_L8T · Mar 24, 2026

buckwild27 said:
For a small fee I can fix you up there too no stupid lifter issues with this beast. View attachment 480702 View attachment 480703

i like where this is going

Too_L8T · Mar 24, 2026

buckwild27 said:
You don't think she would enjoy 800hp?

I already sit in the 3rd row when my wife drives. I couldnt imagine her with 800hp

fredcook · Mar 24, 2026

Did you diagnose to see if the lifter is just stuck. They can sometimes be fixed. I have come across two people so far that have used the lifter release tool from Crazed Performance.

Video:

Site: https://www.crazedperformancerepair.com/afm-dfm-lifter-repair

Too_L8T · Mar 24, 2026

buckwild27 said:
Thank you for your eyeball dyno run. I guess it really is true sometimes you get what you pay for. It's a good thing i didn't pay you for the multiple dyno runs, multiple pulleys, and a few sets of injectors. And spent every ounce of my free time building the damn truck when I could have just come here to get your free insight. When you have no idea what's gone into everything in that picture other than a procharger that I'm going to guess you don't even know the size of. Ok real man of genius. Tell me how much hp I'm making. I'll stop wasting money on dyno runs now that I have you to tell me what I'm making for hp numbers. View attachment 481093 View attachment 481094 View attachment 481095

looks like about 135hp to me

West 1 · Mar 24, 2026

I used the Crazed Performance trick to free a stuck lifter twice. Worked great both times and I deleted the AFM on both of those. I would have done more that way but I was advised it would cause issues with the California Smog checks so I quit using that method. Both rigs were fixed and kept running great after the crazed performance repair they were just normal V8's after the repair. No more AFM to worry about.

buckwild27 · Mar 24, 2026

hagar said:
I zoomed in to see which head unit it is before commenting and its a D1sc. Even if it has a 20 percent overdrive lower, that is one massive charger pulley to be making 800 hp!
All of the D1 cars i have ever built, take way more boost than that is pullied for to make 800 hp.
What is that pulley size and what is your lower pulley size? Don't even need a dyno graph to know the power something has the potential of making when it is a fixed drive pulley ratio that makes a known cfm at said ratio and rpm.

Looks like a 5 inch upper from here.

It's in the 4's exact size i don't remember and I'm working out of state so no i can't check. but I was at the dyno and seen the numbers myself when they did it on the hub dyno. It is maxed out. But it infact made 800hp. Do I disagree it needs a better setup. No! It most assuredly needs better pulleys with more ribs and maybe a bigger charger. And probably a meth injection. I have no reason to blow smoke up anyone's ass about the damn thing. Nor do I care to. It took me forever to build and just barely finish just to have some drunk A-hole crash through the 3rd garage in 4 weeks and turn the perfectly straight no accidents low mileage truck into a crumpled can.

hagar · Mar 24, 2026

buckwild27 said:
It's in the 4's exact size i don't remember and I'm working out of state so no i can't check. but I was at the dyno and seen the numbers myself when they did it on the hub dyno. It is maxed out. But it infact made 800hp. Do I disagree it needs a better setup. No! It most assuredly needs better pulleys with more ribs and maybe a bigger charger. And probably a meth injection. I have no reason to blow smoke up anyone's ass about the damn thing. Nor do I care to. It took me forever to build and just barely finish just to have some drunk A-hole crash through the 3rd garage in 4 weeks and turn the perfectly straight no accidents low mileage truck into a crumpled can.

All good, the record I have personally made with a D1 was 815 wheel with a c6 corvette standard trans with a 418 stroker and trickflow heads/102mm intake set up. That was slightly over spinning the rated max rpm and shifting at 7500 rpm. That was a 10 percent overdrive bottom with a 2.8 inch upper. That 4.8 inch pulley on yours is what comes stock on a d1 for a stock 6 liter to make like 420 wheel on my dyno.
I assumed since you were posting up your engine in a thread about someone's lifter, you were down for the attention on it. Carry on.

thefrey · Mar 24, 2026

fredcook said:
Did you diagnose to see if the lifter is just stuck. They can sometimes be fixed. I have come across two people so far that have used the lifter release tool from Crazed Performance.

Video:

Site: https://www.crazedperformancerepair.com/afm-dfm-lifter-repair

This worked for me and kept my lifter unstuck for 15k miles before I did a mechanical delete

Well I think a lifter left the chat

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