Chevy 5.3 6.0 LS EGR EVAP Delete

Why Does Your Chevy 5.3 or 6.0 LS Need an EGR and EVAP Delete?

The factory emissions hardware on a Gen III Vortec was designed to meet a regulatory box, not to keep your intake clean over 200,000 miles of work-truck duty. Once it starts to fail, it drags down the rest of the engine. Here is what we see in the shop over and over.

Carbon Coking in the Intake Manifold and on the Intake Valves

The EGR system feeds a steady stream of sooty exhaust gas back into the intake plenum, and on a 5.3 or 6.0 LS that carbon bakes onto the intake runners and the back of the intake valves.
As the crust builds, airflow goes turbulent, the throttle response gets soggy, and the truck starts to ping under a load.
Blocking the EGR at the manifold stops that carbon at the source instead of letting it coat the inside of a perfectly good composite intake.

Stuck EGR Valve and Recurring P0401 Codes

The pintle inside the factory EGR valve gums up with the same carbon it is trying to meter, until it sticks open or closed and throws a P0401 insufficient flow code.
A stuck-open EGR at idle causes a rough, lean misfire and a stall coming up to a stoplight, and a stuck-closed valve keeps the check engine light on for good.
An EGR block off plate caps the port so the valve can no longer dictate how your engine idles.

EVAP Purge Solenoid Failure and Fuel Vapor Leaks

The EVAP purge solenoid is the little valve on top of the intake that meters fuel tank vapor into the engine, and on a 20-year-old truck the housing cracks or the internal spring fatigues.
That leaves you with a raw fuel smell, a P0441 or P0455 EVAP leak code, and a purge circuit you do not actually need on a built or swapped truck.
The purge solenoid plug and EVAP block off plate in these kits seal that circuit off for good.

What Can an EGR and EVAP Delete Solve?

The right kit gives you cleaner air, a sealed intake, and a wiring harness you can simplify in an afternoon. Here is what changes the moment these plates go in.

Cleaner Combustion Air and a Cooler, Denser Intake Charge

With the EGR capped, the engine breathes 100 percent fresh filtered air instead of re-breathing exhaust, the intake charge stays cooler and denser, and the combustion timing stays stable under tow.
Owners consistently report sharper throttle response and a smoother idle once the carbon source is removed.
Pair the plates with a tune and the PCM stops chasing the EGR and EVAP monitor readiness altogether.

Caps the EGR Ports at the Passenger Manifold and the Intake

Every plate is CNC-profiled to the Gen III LS truck intake and the passenger side exhaust manifold flange, so you bolt it in with no grinding, no RTV, and no mystery gasket.
The 3.5mm 6061-T6 billet body will not warp like a thin stamped steel plate, and the Viton gasket holds boost and heat without weeping.
It is a permanent seal, not a band-aid.

Seals the EVAP Purge Circuit for LS Swap and Race Builds

If you stuffed a 5.3 or 6.0 into an older Chevy, a Camaro, or a buggy, you do not want to plumb a charcoal canister and a purge line just to feed the factory EVAP logic.
The purge solenoid plug and EVAP block off plate let you cap that port at the intake and delete the circuit cleanly.
You keep a factory-look manifold with none of the dangling emissions plumbing.

Shop Chevy 5.3 6.0 LS EGR EVAP Delete by Chevrolet/GMC Engine & Fitment Guide

• EGR Delete Plate Intake and Exhaust Block Off Kit for 4.8L/5.3L/6.0L LS LQ4 Chevrolet/GMC 1999-2007 - Fits the Gen III 4.8L LR4, 5.3L LM7, and 6.0L LQ4/LQ9 Vortec in Chevy Silverado and GMC Sierra 1500/2500HD/3500 trucks from 1999 to 2007. This is the broadest EGR-only coverage in the lineup, capping both the intake port and the passenger side exhaust manifold EGR tube with a 3.5mm 6061-T6 billet plate, Viton gasket, and stainless hardware.
• EGR and EVAP Valve Block Off Plates Kit with Purge Solenoid Plug for 5.3L/6.0L LS - Fits the 5.3L LM7 and 6.0L LQ4/LQ9 Vortec in Chevy Silverado and GMC Sierra 1500/2500HD trucks from 1999 to 2007. This combo kit handles both jobs at once, blocking the EGR at the intake and exhaust and sealing the EVAP purge circuit with a CNC billet plug, ideal for a truck that needs both circuits gone.
• EGR Valve Block Off Plates Kit for Chevy 5.3L/6.0L LM7, LS LQ4, LQ9 with Purge Solenoid Plug, Intake/Exhaust - Fits the 5.3L LM7 and 6.0L LQ4/LQ9 Vortec in Chevy Silverado and GMC Sierra from 1999 to 2007. Ships with intake and exhaust EGR plates plus the purge solenoid plug, the same complete EGR and EVAP delete coverage for a 2000 Silverado 5.3 or a 2002 Silverado 6.0 that keeps throwing emissions codes.

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What does an EGR delete do on a Chevy 5.3 or 6.0 LS truck engine?

An EGR delete caps the exhaust gas recirculation port on a Gen III 4.8L, 5.3L, or 6.0L Vortec LS so that hot, sooty exhaust can no longer be routed back into the intake manifold.
That stops the carbon coking on the intake runners and valves, removes the stuck EGR pintle that throws P0401 codes, and lets the engine breathe 100 percent fresh filtered air.
On a 1999-2007 Silverado or Sierra work truck or tow rig, the result is sharper throttle response, a smoother idle, and a cleaner combustion charge under load.

Will a Chevy 5.3 EGR delete kit fit my 2000 Silverado 1500 or a 2002 Silverado 6.0?

Yes. These kits are sized for the 1999-2007 Gen III LS truck intake and the passenger side exhaust manifold, so a 2000 Silverado 1500 with the 5.3L LM7 and a 2002 Silverado 2500 with the 6.0L LQ4 both use the same block off plate footprint.
The EGR plate seals the EGR tube at the manifold and the intake port, and the EVAP and purge solenoid hardware fits the same Gen III Vortec layout.
Confirm your RPO engine code, LM7 for the 5.3 and LQ4 or LQ9 for the 6.0, against the fitment table before you order so you grab the right combo kit.

What does an LS EVAP delete plug do, and why would I block off the EVAP purge?

The EVAP delete plug seals the purge solenoid port on top of the LS truck intake so the engine no longer draws fuel tank vapor through the charcoal canister circuit.
On a 20-year-old truck the purge solenoid housing cracks and the spring fatigues, which sets a P0441 or P0455 EVAP leak code and leaves a raw fuel smell under the hood.
Blocking the EVAP purge with a CNC billet plug is also the standard move on an LS swap, where you do not want to plumb a canister and purge line into an older chassis just to feed factory emissions logic.

What is the difference between an EGR block off plate and a full EGR delete kit on a 5.3 Vortec?

An EGR block off plate is the physical 6061-T6 billet cap that seals the EGR port, and on a 5.3 Vortec that is the part that actually stops the carbon flow, since the EGR tube runs from the passenger side exhaust manifold straight into the intake.
A full EGR delete kit like the ones in this collection pairs that intake and exhaust block off plate with the gaskets and stainless hardware, and optionally the EVAP block off and purge solenoid plug, in one bag.
Most owners do not remove the entire EGR valve and tube assembly from the bay, they just cap it, so a quality block off kit is functionally the delete for these trucks.

Do I need to delete both EGR and EVAP on my LS truck intake?

Not always, but most shops do them together because the intake is already off and both systems live on top of it.
If your 5.3 or 6.0 is still emissions-registered and you only want to stop the carbon, run the EGR-only plate kit and leave the EVAP purge alone.
If you are building a tow rig, a trail truck, or an LS swap and want a clean, simplified intake with no emissions plumbing, grab the EGR and EVAP combo kit that bundles the block off plates with the purge solenoid plug.

Will these plates work for an LS swap evap delete or an LS1 evap delete?

These plates are profiled to the Gen III LS truck intake used on the 4.8L, 5.3L, and 6.0L, so an LS swap that reuses the truck intake and truck throttle body uses these exact EGR and EVAP block off plates.
The LS1 car intake on a Camaro, Firebird, or Corvette has a different manifold and throttle body layout and a different EVAP purge arrangement, so these truck plates will not seal an LS1 car intake without confirming the port sizing first.
If your swap runs a car intake, measure the purge and EGR port diameter before ordering so you get a clean seal.

Can I use this kit for an LSA evap delete or a 6.0 Vortec EGR delete?

For a 6.0 Vortec EGR delete the answer is yes, the plates fit the LQ4 and LQ9 in the 1999-2007 Silverado and Sierra 2500HD.
For an LSA evap delete the answer is no, the LSA is a supercharged 6.2L with a totally different lid, blower, and EVAP layout, and these truck intake plates will not seal against an LSA manifold.
The LSA does not use the same Gen III truck intake purge port, so confirm you actually have a naturally aspirated truck intake before you order.

What does the purge valve delete plug do in the kit, and is hardware included?

The purge valve delete plug, sometimes called the purge solenoid plug, threads or pushes into the EVAP purge port on the LS truck intake and seals it so you can remove the purge solenoid and its vacuum line cleanly.
Every kit in this collection ships with the CNC billet plates, high-temperature Viton gaskets, and the stainless steel bolts needed to do the intake and exhaust EGR caps plus the EVAP block off in one job.
You will not need to make a parts run halfway through the install.

Do I need a tune after deleting EGR and EVAP on my Chevy truck?

Yes, you will want a tune. Once the EGR and EVAP hardware is physically capped, the powertrain control module will still try to run the EGR and EVAP monitor readiness tests and can set a check engine light for insufficient EGR flow or EVAP leak.
A tune turns off the EGR and EVAP diagnostics in the PCM so the monitor stops chasing circuits you have removed, and it also corrects the fuel and spark trims now that the engine is breathing clean air.
Without a tune the truck will still run, but the light will stay on and you will not get the full benefit of the delete.

Is this EGR and EVAP delete street legal, and what is the warranty and return policy?

These EGR and EVAP block off kits are sold for competition and closed-course off-road use only, because they remove factory emissions control devices and are not legal for use on pollution-controlled vehicles registered for the street in many jurisdictions.
Always confirm your RPO engine code, LM7 for the 5.3 and LQ4 or LQ9 for the 6.0, and your intake manifold style against the fitment table before ordering, since these plates are sized for the 1999-2007 Gen III LS truck intake and will not seal an LS1 car intake or an LSA blower setup.
Every kit includes free shipping, is backed by our 1-year warranty, and comes with a 45-day return policy so you can build with confidence.