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GM’s 6.0L Vortec V8 (LQ4/LQ9/L96, used across Silverado, Sierra, Suburban, Tahoe and Yukon trucks from the early 2000s through the mid-2010s) has a well-documented ignition upgrade path – both from GM’s own OE parts and from the aftermarket. Here are real, currently-listed spark plugs and wire sets specifically referenced for this engine, not generic ‘fits most V8s’ listings.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | ACDelco 41-993 Iridium Spark Plug | $8-$12 per plug | Amazon · eBay |
| 2 | ACDelco 41-110 Iridium Spark Plug | $8-$12 per plug | Amazon · eBay |
| 3 | ACDelco 41-962 Double Platinum Spark Plug | $6-$10 per plug | Amazon · eBay |
| 4 | NGK Iridium IX TR55IX Spark Plug (NGK 7164) | $6-$10 per plug | Amazon · eBay |
| 5 | Denso Iridium Power IK20 Spark Plug | $60-$90 per 8-pack | Amazon · eBay |
| 6 | Bosch Platinum+4 4417 Spark Plug (FGR7DQP) | $6-$10 per plug | Amazon · eBay |
| 7 | MSD 32829 Super Conductor 8.5mm Wire Set | $90-$130 | Amazon · eBay |
| 8 | ACDelco 9748UU Professional Spark Plug Wire Set | $40-$70 | Amazon · eBay |
| 9 | Taylor Cable ThunderVolt 50 8mm Wire Set | $60-$100 | Amazon · eBay |
| 10 | Herko Racing 10.2mm Spark Plug Wire Set | $30-$50 | Amazon · eBay |
The picks, in detail
ACDelco 41-993 Iridium Spark Plug
ACDelco’s GM Original Equipment iridium plug, the direct OE-spec replacement for 6.0L Vortec trucks.
- Iridium center electrode
- GM Original Equipment part
- Direct OE fitment for Vortec V8 trucks
- Exact OE replacement, so no guesswork on gap or heat range
- Not a performance upgrade over stock, just a correct-spec replacement
ACDelco 41-110 Iridium Spark Plug
ACDelco’s updated iridium plug, cited specifically as the current recommendation for 2007-and-newer 6.0L Vortec trucks.
- Iridium tip
- GM-specified update to the older 41-962 double-platinum plug
- Fits 2007+ 6.0L Vortec (LQ4/LQ9/L96)
- The plug GM itself points to for these later Vortec model years
- 2006-and-older trucks should check whether 41-962 is still the correct spec instead
ACDelco 41-962 Double Platinum Spark Plug
The correct OE spec for 2006-and-older 6.0L Vortec trucks, before GM’s iridium update.
- Double platinum pads on a copper core
- GM Original Equipment part
- Correct spec for pre-2007 Vortec trucks
- Matches the original factory spec on earlier Vortec model years
- Superseded by iridium plugs (41-110/41-993) on newer trucks
NGK Iridium IX TR55IX Spark Plug (NGK 7164)
NGK’s popular Iridium IX upgrade plug, commonly run on GM Vortec V8s including the 6.0L (LQ4/LQ9).
- Iridium fine-wire center electrode
- NGK stock #7164
- Fits GM 4.8/5.3/5.7/6.0L Vortec V8s (LR4, LM4, LM7, L59, LQ4, LQ9)
- Widely used as the go-to aftermarket iridium upgrade on Vortec V8s
- A few owners report needing to re-check the factory gap out of the box
Denso Iridium Power IK20 Spark Plug
Denso’s iridium plug, sold in 8-packs specifically fitted for the 6.0L Silverado/Sierra 2500HD.
- 0.4mm iridium tip for maximum spark energy
- Denso stock #5304
- Sold in 8-piece kits for 6.0L Silverado/Sierra 2500HD
- Sold as a matched 8-plug kit sized for a V8, not single plugs
- Priced a bit above the ACDelco OE options
Bosch Platinum+4 4417 Spark Plug (FGR7DQP)
Bosch’s 4-ground-strap platinum plug, listed as fitting 2000-2013 Silverado/Sierra 4.8/5.3/6.0/6.2L V8s.
- 4 yttrium-enhanced ground electrodes for consistent spark as it wears
- Factory-set gap
- Fits 2000-2013 GM 4.8/5.3/6.0/6.2L V8 trucks
- 4-ground-strap design is built specifically for long-term consistency as the plug wears
- Platinum, not iridium – shorter service life than the NGK/Denso/ACDelco iridium options
MSD 32829 Super Conductor 8.5mm Wire Set
MSD’s Super Conductor wire set built specifically for GM 4.8/5.3/6.0/6.2L truck V8s.
- 8.5mm helically-wound core, 40-50 ohms/ft resistance
- Silicone jacket over heavy glass braid
- Dual-crimped stainless terminals
- Fits GM Truck/SUV 4.8/5.3/6.0/6.2L V8, 1999-2013
- Correct truck-specific MSD part, not the LS1/Corvette version some listings confuse it with
- Pricier than the ACDelco OE-style wire set
ACDelco 9748UU Professional Spark Plug Wire Set
ACDelco’s OE-style replacement wire set, listed as fitting 2009-2018 Silverado/Sierra with the 6.0L engine.
- Full fiberglass braid with silicone insulation
- Carbon latex reactive layer over stainless windings
- Fits 2009-2018 Silverado/Sierra 5.3/6.0/6.2L
- Direct OE-spec replacement, easiest drop-in choice
- Not a performance wire – just a correct-spec factory replacement
Taylor Cable ThunderVolt 50 8mm Wire Set
Taylor Cable’s popular truck-community 8mm wire set, a common upgrade pick for GM Vortec engines.
- 8mm thick silicone jacket
- Multiple boot angle options for tight header clearance
- Sold in GM Vortec V8-specific kits
- Well regarded specifically in the GM truck community for durability
- Confirm the exact kit variant matches your engine’s boot-angle needs
Herko Racing 10.2mm Spark Plug Wire Set
A higher-gauge 10.2mm wire set sold specifically for Chevy/GMC 5.3L and 6.0L Vortec trucks.
- 10.2mm wire diameter
- Sold specifically for Chevy/GMC 5.3L/6.0L Vortec trucks
- Direct-fit boots
- Thicker gauge than most OE-style sets, at a budget price
- Less brand recognition than MSD or Taylor
Buying tips
- Match the plug to your truck’s model year, not just the engine size – GM updated its own factory spec from the 41-962 double-platinum to the iridium 41-110/41-993 partway through the 6.0L Vortec’s production run.
- If you’re replacing wires, do it at the same time as plugs, not separately – worn factory wires are a common cause of a ‘new plugs didn’t fix my misfire’ comeback.
- Double-check any wire set’s listed engine range before buying – MSD in particular sells a visually similar Super Conductor set (32819) built for the LS1 Corvette/Camaro that will not fit a truck-block Vortec the way the 32829 does.
- Gap the plugs to GM’s spec before installing even if the box says ‘pre-gapped’ – shipping and handling can knock a plug’s gap out of spec.
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