04 Silverado started knocking, what could it be? Rebuild started

[OR VietVet]

There is metal in the engine in spots it should not be.

 

[Rocket Man]

After a close examination of the cam thru the lifter hole, I could see the damage done to the cam. The damage keeps getting worst. I'm starting to think the builder (Velocity parts & performance) used the wrong springs and created float on the lifters during high revs.

Does he have a parts list of what they used along with the cam specs? If it’s a real high lift cam they should have been dual springs.

 

[Blackcar]

After a close examination of the cam thru the lifter hole, I could see the damage done to the cam. The damage keeps getting worst. I'm starting to think the builder (Velocity parts & performance) used the wrong springs and created float on the lifters during high revs.

How long ago did engine get rebuilt they may need to be involved with problem.

 

[ivin74]

Does he have a parts list of what they used along with the cam specs? If it’s a real high lift cam they should have been dual sprin

You are correct they should have used a dual spring setup.

Cam Specs
TSP 220R .600 lift 110LSA
TSP Chrome Moly 7.40 pushrods
LS7 lifters

 

[ivin74]

How long ago did engine get rebuilt they may need to be involved with problem.

I got with them this morning and the parts were out of warranty, the work was done in 2020. They did give me a big discount on the new parts I purchase from them this morning.

New cam (just a bit bigger)
Dual spring setup
Chrome moly pushrods
OEM LS7 Lifters

 

[OR VietVet]

If they should have used dual springs, did they? You did not say. If they did not, they should warranty.

 

[Blackcar]

I got with them this morning and the parts were out of warranty, the work was done in 2020. They did give me a big discount on the new parts I purchase from them this morning.

New cam (just a bit bigger)
Dual spring setup
Chrome moly pushrods
OEM LS7 Lifters

How many miles were on engine since repair, I wouldn't use the push rods they used they shouldn't look that bad almost looks like they weren't heat treated correctly. Good luck with your repair.

 

[ivin74]

If they should have used dual springs, did they? You did not say. If they did not, they should warranty.

They should have, and they didn't. The answer I got was that 1/2 of the staff that worked there no longer work there. That shit doesn't fly, anyways he hooked me up with the parts(discounted). I'm doing the work now so, we are saving the labor cost. We are only out a bit of money and my son's & my time.

 

[Rocket Man]

You are correct they should have used a dual spring setup.

Cam Specs
TSP 220R .600 lift 110LSA
TSP Chrome Moly 7.40 pushrods
LS7 lifters

Yep. .600 lift definitely needs dual springs. Just ask @Dantheman1540. Good luck on the repairs, I know there might be metal throughout unfortunately. The duals are a ***** to install fyi so get a good spring compressor, not one of those stamped pos’s.

 

[Dantheman1540]

Yep. .600 lift definitely needs dual springs. Just ask @Dantheman1540. Good luck on the repairs, I know there might be metal throughout unfortunately. The duals are a ***** to install fyi so get a good spring compressor, not one of those stamped pos’s.

Couldn’t be said any better, when I swapped my nice valves and dual springs into my ported 243s I broke multiple spring compressors. After I finally got a good spring compressor I nearly stripped rocker arm threads out of the heads. Go slow, and every turn or some on the spring compressor give the valve a “Bop-a-doodle-do” because sometimes the seats are just bound up it’s easy to over pressure it and put strain on the aluminum threads holding the tool in.

Hopefully that makes sense.

 

[Rocket Man]

They should have, and they didn't. The answer I got was that 1/2 of the staff that worked there no longer work there. That shit doesn't fly, anyways he hooked me up with the parts(discounted). I'm doing the work now so, we are saving the labor cost. We are only out a bit of money and my son's & my time.

This is why I do my own work. Especially when it’s something that can ruin an engine.

Couldn’t be said any better, when I swapped my nice valves and dual springs into my ported 243s I broke multiple spring compressors. After I finally got a good spring compressor I nearly stripped rocker arm threads out of the heads. Go slow, and every turn or some on the spring compressor give the valve a “Bop-a-doodle-do” because sometimes the seats are just bound up it’s easy to over pressure it and put strain on the aluminum threads holding the tool in.

Hopefully that makes sense.

One other thing I just thought of - use oil on the threads of the spring compressor, constantly. The strain the compressor put on the threads makes them want to bind if you don’t keep them oiled as you move along. I re-oil them for every spring or if I notice the nut getting hard to turn. You’ll see it makes a difference. Just something I learned.

 

[RAMurphy]

Couldn’t be said any better, when I swapped my nice valves and dual springs into my ported 243s I broke multiple spring compressors. After I finally got a good spring compressor I nearly stripped rocker arm threads out of the heads. Go slow, and every turn or some on the spring compressor give the valve a “Bop-a-doodle-do” because sometimes the seats are just bound up it’s easy to over pressure it and put strain on the aluminum threads holding the tool in.

Hopefully that makes sense.

@Dantheman1540 Do you have the part number of your spring compressor. I'm thinking of rebuilding the engine I pulled out when I dropped a new upgraded engine into my Tahoe. My old heads have dual springs and I may want to have the heads refurbished.

 

[Dantheman1540]

This is why I do my own work. Especially when it’s something that can ruin an engine.

One other thing I just thought of - use oil on the threads of the spring compressor, constantly. The strain the compressor put on the threads makes them want to bind if you don’t keep them oiled as you move along. I re-oil them for every spring or if I notice the nut getting hard to turn. You’ll see it makes a difference. Just something I learned.

Genius, wish I’d thought of that honestly.

@Dantheman1540 Do you have the part number of your spring compressor. I'm thinking of rebuilding the engine I pulled out when I dropped a new upgraded engine into my Tahoe. My old heads have dual springs and I may want to have the heads refurbished.

Here’s a link! Iirc I bought better bolts to use with it because I bent them. I’m also a savage and can break anything, be less like me.

COMP Cams 5462 Valve Spring Compressor for LS Engine https://a.co/d/bsnRRgJ

 

[OR VietVet]

They should have, and they didn't. The answer I got was that 1/2 of the staff that worked there no longer work there. That shit doesn't fly, anyways he hooked me up with the parts(discounted). I'm doing the work now so, we are saving the labor cost. We are only out a bit of money and my son's & my time.

Half staff gone and that makes a warranty difference? C'mon man! I see where you are coming from but that company sounds like a fly by night crap shoot.

 

[Rocket Man]

I used one like this. Simple, cheap, works great. I did have to adjust the position just right before starting to compress the dual springs so the valve stem would be centered when compressed and the keepers would go on. And don’t forget to use a dab of grease on the keepers when you install them so they stay put.

Valve Spring Compressor Tool for GM LS LSX LS1 LS2 LS3 LS6 LS7 LS9 LQ4 Engines | eBay

Find many great new & used options and get the best deals for Valve Spring Compressor Tool for GM LS LSX LS1 LS2 LS3 LS6 LS7 LS9 LQ4 Engines at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[corvette744]

I got with them this morning and the parts were out of warranty, the work was done in 2020. They did give me a big discount on the new parts I purchase from them this morning.

New cam (just a bit bigger)
Dual spring setup
Chrome moly pushrods
OEM LS7 Lifters

Dam those push rods and cam look like they have 400,000 miles on them.Make sure your getting the correct parts for the lift and duration.Hell now be ready to put new cam bearings in and maybe rod and crank also.It does not look good from what you have shown.What was the oil pressure at idle when warm.

 

[ivin74]

This is why I do my own work. Especially when it’s something that can ruin an engine.

One other thing I just thought of - use oil on the threads of the spring compressor, constantly. The strain the compressor put on the threads makes them want to bind if you don’t keep them oiled as you move along. I re-oil them for every spring or if I notice the nut getting hard to turn. You’ll see it makes a difference. Just something I learned.

Great idea, I had not thought about that.

@Dantheman1540 Do you have the part number of your spring compressor. I'm thinking of rebuilding the engine I pulled out when I dropped a new upgraded engine into my Tahoe. My old heads have dual springs and I may want to have the heads refurbished.

I'm using the C-Clamp Valve Spring Compressor tool kit, it makes it so much easier putting in the springs. The heads have to be removed to use this style of compressor kit.

Spring Compressor Tool,C Clamp Valve Spring Compressor Tool Set

This Spring Compressor Tool set by OMT includes a wide C clamp, 3 extension rods (3" 4.4" & 4.4"), 5 collet adapters (16 19 23 25 & 30mm), and a 4-inch hand lever.

orionmotortech.com

Half staff gone and that makes a warranty difference? C'mon man! I see where you are coming from but that company sounds like a fly by night crap shoot.

I'm done with those yahoos. I would not let that shop touch any of my vehicles again, not even for warranty work. I also blame myself for not being educated enough at the time on rebuilding/modifying engines. I took it for granted and let the experts do the work (experts, in taking people's money). This is the second time I have gotten screwed by a shop. The first time was when I had a transmission shop rebuild the front diff of my Yukon (I ended up rebuilding it again a year and a half.) after I rebuilt it, it has been on the road for 5 years and with no issues so far.

I now try to do most of the mechanic work, at least until I'm able to.

Front differential rebuild GM 8.25 IFS (needs to be a sticky)

While searching how to rebuild the front diff on my Yukon I ran into this thread that I think should be a stick on this site. Its a very detail DIY, the only thing that I would add to this DIY is to replace the side gear washers and the spider gear washers on the carrier since you are already...

www.tahoeyukonforum.com

 

[iamdub]

@Dantheman1540 Do you have the part number of your spring compressor. I'm thinking of rebuilding the engine I pulled out when I dropped a new upgraded engine into my Tahoe. My old heads have dual springs and I may want to have the heads refurbished.

If you bring them to a shop for machining and rebuilding, they should have a bench-mounted compressor where they position the head underneath it and pull a long lever to make easy and quick work of it. The other, smaller screw-style types are for working the springs with the heads still on the engine and/or in the vehicle. Let the shop do the tedious work if they're gonna do the machining.

 

[RAMurphy]

Genius, wish I’d thought of that honestly.



Here’s a link! Iirc I bought better bolts to use with it because I bent them. I’m also a savage and can break anything, be less like me.

COMP Cams 5462 Valve Spring Compressor for LS Engine https://a.co/d/bsnRRgJ

Thank you for the link.

 

[RAMurphy]

I used one like this. Simple, cheap, works great. I did have to adjust the position just right before starting to compress the dual springs so the valve stem would be centered when compressed and the keepers would go on. And don’t forget to use a dab of grease on the keepers when you install them so they stay put.

Valve Spring Compressor Tool for GM LS LSX LS1 LS2 LS3 LS6 LS7 LS9 LQ4 Engines | eBay

Find many great new & used options and get the best deals for Valve Spring Compressor Tool for GM LS LSX LS1 LS2 LS3 LS6 LS7 LS9 LQ4 Engines at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Thank you for the link.