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