jwillie128

Hi everyone, I’m new here. I’ve been doing lots of research and I can’t seem to figure out an answer to my problem. My buddy and I swapped his truck (2000 GMC Sierra) from a 4.8 to a Gen 4 6.0 with milled 243 heads. The heads are milled .040. The bottom end is stock. We’re using the lingenfelter box to run the 58x reluctor wheel.

The problem were having is a ticking noise. It’s not the lifters, bc they’re brand new and we’ve swapped them out already. We’ve tried multiple different length pushrods (7.250, 7.300, 7.394) and nothing will make it quieter. It runs great, with no issues which is part of the reason I’m puzzled. No matter what we change the ticking won’t go away.

Any help or or advice would be greatly appreciated, Thanks!


EDIT! I’ve attached a video of the noise

Tuskyz28

What oil ?

jwillie128

15w-40

Tuskyz28

What brand ? All oil brands are not the same.

jwillie128

My bad, it’s Eco Power synthetic blend. It’s a bulk oil I bought. Could it be too thick of an oil?

rkupon1

iTrader: (3)

Tried simplier process of elimination yet? Remove serpentine belt for a few seconds...it ll rule out all pulleys and idlers, etc

jwillie128

We’ll definitely try that tomorrow. Gonna try tightening the manifolds and y pipe, maybe an exhaust leak?

andrewss

iTrader: (1)

Kinda sounds like an exhaust leak Sometimes you can hear noises better from under the engine..

jwillie128

Confirmed tonight that it’s not an exhaust leak and not any of the pulleys. The noise sounds like it’s farther to the front of the motor but it’s hard to tell

01CamaroSSTx

iTrader: (3)

Sounds valve train related to me.

bortous

Sounds valvetrain related to me too.

Project GatTagO

iTrader: (7)

That can easily be injector noise.

Andrew

jwillie128

That’s what I’m thinking. I’m gonna try shimming the rocker pedestal .010 at a time and see if that makes any difference.
​​​​​

Yeah but all the injectors are brand new. However one of them could have failed

Project GatTagO

iTrader: (7)

Just because they are new, doesn't mean they don't make noise. That's the reason many LS engines had the factor engine covers, to cut down on noise.

G Atsma

Every injected engine I have heard makes SOME injector noise. Just the lightest clickety.....

jwillie128

Yeah I know some noise is normal but it definitely shouldn’t be this loud. I may also go into HP Tuners and turn them off one by one to see if that affects the noise

Ls7colorado

iTrader: (3)

seriously sounds like a exhaust leak, how did you rule it out?
take a water hose and spray around the manifolds/headers (without it being to hot of course)

Loose spark plug?

Stampede4ever

Sounds like exhaust leak,. Check it with a smoke machine, easy to make.


Stampede

Utinator

I would check the valve covers. If you have aftermarket rocker arms in there, then they are probably hitting inside the valve covers.

01CamaroSSTx

iTrader: (3)

Once again it sounds valvetrain related to me and ↑↑↑ the rocker making contact with the valve cover is a possibility and so is the rocker arm making contact with an aftermarket rocker arm bolt a possibility.