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

[Joeltz]

The truck is my son's 2004 silverado extended cab. He has it cam'ed out, headers, tune and other misc stuff including a high perf transmission. The truck is not his daily. This afternoon he took it for a drive and got on it hard. After a couple of runs he heard some knocking. I would like to hear from the experience folks what you all think broke.

He is going to get it towed to my house tomorrow, probably will start by removing the heads and inspect the top end.

Pull 1 spark plug wire off at a time to listen & probably find the Knocking cyl. Maybe get a look in that cyl to see what’s wrong

 

[corvette744]

Pull 1 spark plug wire off at a time to listen & probably find the Knocking cyl. Maybe get a look in that cyl to see what’s wrong

Huh the engine is apart already dude read the previous posts lol.

 

[Blackcar]

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.

Also, with higher lift cam they (Machine Shop) can check for spring binding and clearance.

 

[ivin74]

Update
Removed the springs and valves from the heads and got them machined.

Also cleaned up the heads a bit

 

[RAMurphy]

Nice job. Looking forward to the final results.

 

[corvette744]

Update
Removed the springs and valves from the head and got the head machined.

Also cleaned up the heads a bit

Did they do a valve job also it looks like they did.

 

[ivin74]

Did they do a valve job also it looks like they did.

Nope, just a good cleaning

 

[Blackcar]

Do you know how much was cut off face of heads. Did they cc heads.

 

[ivin74]

Do you know how much was cut off face of heads. Did they cc heads.

They started with 2 thousands but you could still see the gaskets indentions so I had them do 3 thousands. They did not touch the combustion chambers

 

[ivin74]

Last week I caught the flu and was not able to work on the truck but today we kicked butt.

Installed the dual springs on the heads

 

[OR VietVet]

That sure is PURDY!

 

[ivin74]

Removed the oil pan and tray and found more broken lifter pieces. There was 1 piece that I could not find and I was not going to close up the engine knowing there was still loose debris in the engine


After blowing air and inspecting the crankshaft and pistons I ended up finding the missing lifter piece hiding behind the crankshaft reluctor wheel in a cubby hole

 

[ivin74]

Removed the old camshaft and installed the new one in. Got one head in along with rockers.


Also upgrade the rocker arms with the
Michigan Motorsports LS1 Rocker Arms Bronze Bushing Trunion kit.

 

[iamdub]

Removed the old camshaft and installed the new one in. Got one head in along with rockers.


Also upgrade the rocker arms with the
Michigan Motorsports LS1 Rocker Arms Bronze Bushing Trunion kit.

That's a rowdy stick for a 5.3! Well, I assume 5.3 cuz of the 706 heads. Stall? Gears? Any vids of it running before the failure?

 

[OR VietVet]

Removed the oil pan and tray and found more broken lifter pieces. There was 1 piece that I could not find and I was not going to close up the engine knowing there was still loose debris in the engine


After blowing air and inspecting the crankshaft and pistons I ended up finding the missing lifter piece hiding behind the crankshaft reluctor wheel in a cubby hole

Removed the old camshaft and installed the new one in. Got one head in along with rockers.


Also upgrade the rocker arms with the
Michigan Motorsports LS1 Rocker Arms Bronze Bushing Trunion kit.

All of which is exactly why I have said time and time again, when you see metal gone, you gotta go find it.

 

[RAMurphy]

I agree that is quite a cam for the 5.3. Looking forward to hearing this thing run when you finish.

 

[ivin74]

That's a rowdy stick for a 5.3! Well, I assume 5.3 cuz of the 706 heads. Stall? Gears? Any vids of it running before the failure?

Here you go

 

[Rocket Man]

Here you go

Lol “ just going around the block making some noise”.

 

[OR VietVet]

Here you go

Right hand drive?

 

[ivin74]

Right hand drive?

Lol.
Nope, that's how my phone took the video.