The Texas Speed NSR 6.0 LS Chopacabra Camshaft brings the Chopacabra idle to cathedral-port 6.0L LS engines in a drop-in package. NSR stands for No Springs Required: the .495" lift works with the factory LS valve springs and stock pushrods, and the cam retains the factory torque converter, so a 4L60E or 4L80E truck can get a loud, choppy idle without a valvetrain overhaul.
The cam measures 220/228 duration at .050", .495"/.495" lift, a 108 degree lobe separation angle and a 106 degree intake centerline, which gives maximum overlap and a rowdy idle without hurting low-speed drivability. Texas Speed dyno tested it on a 370 cubic inch LQ4 with 10:1 compression, stock 317 cathedral-port heads and a TBSS/NNBS intake on 93 octane and estimates a gain of 50 to 70 or more horsepower depending on setup. A custom tune is required after installation.
Specifications
- Duration at .050": 220/228
- Valve lift: .495"/.495"
- Lobe separation angle: 108 degrees
- Intake centerline: 106 degrees
- Engines: 6.0L LS with cathedral-port cylinder heads
- Valve springs: No springs required, works with factory LS valve springs
- Pushrods: Stock pushrods compatible
- Aftermarket stall converter required: No, retains the factory converter (4L60E/4L80E)
- Sound profile: Choppy idle with maximum overlap
- Estimated gain: 50 to 70+ hp depending on setup
- Dyno test engine: 370 CID LQ4, 10:1 compression, stock 317 cathedral heads, TBSS/NNBS intake, 93 octane
- Vehicle usage: Street performance, mid-range
- Chop level: Choppy
Vehicle Applications
Engine families covered: 6.0L LS with cathedral-port cylinder heads (LQ4, LQ9 and LS2 style). Vehicle list reflects Texas Speed's published fitment; confirm the vehicle has a cathedral-port 6.0L.
Chevrolet Corvette
- 2005 Chevrolet Corvette
- 2006 Chevrolet Corvette
- 2007 Chevrolet Corvette
Cadillac CTS-V
- 2006 Cadillac CTS-V
- 2007 Cadillac CTS-V
Cadillac Escalade
- 2002 Cadillac Escalade
- 2003 Cadillac Escalade
- 2004 Cadillac Escalade
- 2005 Cadillac Escalade
- 2006 Cadillac Escalade
- 2009 Cadillac Escalade
- 2010 Cadillac Escalade
- 2011 Cadillac Escalade
- 2012 Cadillac Escalade
- 2013 Cadillac Escalade
Pontiac GTO
- 2005 Pontiac GTO
- 2006 Pontiac GTO
GMC Sierra 1500
- 1999 GMC Sierra 1500
- 2000 GMC Sierra 1500
- 2001 GMC Sierra 1500
- 2002 GMC Sierra 1500
- 2003 GMC Sierra 1500
- 2004 GMC Sierra 1500
- 2005 GMC Sierra 1500
- 2006 GMC Sierra 1500
- 2007 GMC Sierra 1500
- 2008 GMC Sierra 1500
- 2009 GMC Sierra 1500
- 2010 GMC Sierra 1500
- 2011 GMC Sierra 1500
- 2012 GMC Sierra 1500
- 2013 GMC Sierra 1500
GMC Sierra 2500
- 2001 GMC Sierra 2500
- 2002 GMC Sierra 2500
- 2003 GMC Sierra 2500
- 2004 GMC Sierra 2500
- 2005 GMC Sierra 2500
- 2006 GMC Sierra 2500
- 2007 GMC Sierra 2500
GMC Sierra 3500
- 2001 GMC Sierra 3500
- 2002 GMC Sierra 3500
- 2003 GMC Sierra 3500
- 2004 GMC Sierra 3500
- 2005 GMC Sierra 3500
- 2006 GMC Sierra 3500
Chevrolet Silverado 1500
- 1999 Chevrolet Silverado 1500
- 2000 Chevrolet Silverado 1500
- 2001 Chevrolet Silverado 1500
- 2002 Chevrolet Silverado 1500
- 2003 Chevrolet Silverado 1500
- 2004 Chevrolet Silverado 1500
- 2005 Chevrolet Silverado 1500
- 2006 Chevrolet Silverado 1500
- 2007 Chevrolet Silverado 1500
- 2008 Chevrolet Silverado 1500
- 2009 Chevrolet Silverado 1500
- 2010 Chevrolet Silverado 1500
- 2011 Chevrolet Silverado 1500
- 2012 Chevrolet Silverado 1500
- 2013 Chevrolet Silverado 1500
Chevrolet Silverado 2500
- 1999 Chevrolet Silverado 2500
- 2000 Chevrolet Silverado 2500
- 2001 Chevrolet Silverado 2500
- 2002 Chevrolet Silverado 2500
- 2003 Chevrolet Silverado 2500
- 2004 Chevrolet Silverado 2500
- 2005 Chevrolet Silverado 2500
- 2006 Chevrolet Silverado 2500
- 2007 Chevrolet Silverado 2500
Chevrolet Silverado 3500
- 2001 Chevrolet Silverado 3500
- 2002 Chevrolet Silverado 3500
- 2003 Chevrolet Silverado 3500
- 2004 Chevrolet Silverado 3500
- 2005 Chevrolet Silverado 3500
- 2006 Chevrolet Silverado 3500
- 2007 Chevrolet Silverado 3500
Chevrolet Suburban
- 2000 Chevrolet Suburban
- 2001 Chevrolet Suburban
- 2002 Chevrolet Suburban
- 2003 Chevrolet Suburban
- 2004 Chevrolet Suburban
- 2005 Chevrolet Suburban
- 2006 Chevrolet Suburban
- 2007 Chevrolet Suburban
- 2008 Chevrolet Suburban
- 2009 Chevrolet Suburban
- 2010 Chevrolet Suburban
- 2011 Chevrolet Suburban
- 2012 Chevrolet Suburban
- 2013 Chevrolet Suburban
- 2014 Chevrolet Suburban
Chevrolet Suburban 2500
- 2000 Chevrolet Suburban 2500
- 2001 Chevrolet Suburban 2500
- 2002 Chevrolet Suburban 2500
- 2003 Chevrolet Suburban 2500
- 2004 Chevrolet Suburban 2500
- 2005 Chevrolet Suburban 2500
- 2006 Chevrolet Suburban 2500
Chevrolet Tahoe
- 2000 Chevrolet Tahoe
- 2001 Chevrolet Tahoe
- 2002 Chevrolet Tahoe
- 2003 Chevrolet Tahoe
- 2004 Chevrolet Tahoe
- 2005 Chevrolet Tahoe
- 2006 Chevrolet Tahoe
- 2007 Chevrolet Tahoe
- 2008 Chevrolet Tahoe
- 2009 Chevrolet Tahoe
- 2010 Chevrolet Tahoe
- 2011 Chevrolet Tahoe
- 2012 Chevrolet Tahoe
- 2013 Chevrolet Tahoe
- 2014 Chevrolet Tahoe
Chevrolet Trailblazer SS
- 2006 Chevrolet Trailblazer SS
- 2007 Chevrolet Trailblazer SS
- 2008 Chevrolet Trailblazer SS
- 2009 Chevrolet Trailblazer SS
GMC Yukon
- 1999 GMC Yukon
- 2000 GMC Yukon
- 2001 GMC Yukon
- 2002 GMC Yukon
- 2003 GMC Yukon
- 2004 GMC Yukon
- 2005 GMC Yukon
- 2006 GMC Yukon
- 2007 GMC Yukon
- 2008 GMC Yukon
- 2009 GMC Yukon
- 2010 GMC Yukon
- 2011 GMC Yukon
- 2012 GMC Yukon
- 2013 GMC Yukon
- 2014 GMC Yukon
GMC Yukon XL 2500
- 2000 GMC Yukon XL 2500
- 2001 GMC Yukon XL 2500
- 2002 GMC Yukon XL 2500
- 2003 GMC Yukon XL 2500
- 2004 GMC Yukon XL 2500
- 2005 GMC Yukon XL 2500
- 2006 GMC Yukon XL 2500
Vehicle applications reflect the fitment published by Texas Speed & Performance for this part number. Confirm your engine and cylinder head configuration before ordering.
FAQ
What engines does the Texas Speed NSR 6.0 Chopacabra cam fit?
It is made for 6.0L LS engines with cathedral-port cylinder heads, such as the LQ4 and LQ9 in 1999 to 2007 GM trucks and SUVs and the LS2 in the 2005 to 2007 Corvette, GTO, CTS-V and Trailblazer SS. Texas Speed sells a separate NSR Chopacabra for rectangular-port 6.2L engines.
Do I really not need new valve springs with the NSR Chopacabra?
Correct. Texas Speed designed the NSR 6.0 Chopacabra with .495" lift so it works with the factory LS valve springs and stock pushrods, which keeps the installation cost down.
Does the NSR Chopacabra need a stall converter?
No. Texas Speed states the cam retains the factory torque converter and is well suited to 4L60E and 4L80E automatic applications.
How much power does the NSR 6.0 Chopacabra add?
Texas Speed estimates 50 to 70 or more horsepower depending on the setup, based on dyno testing on a 370 cubic inch LQ4 with 10:1 compression, stock 317 heads and a TBSS/NNBS intake on 93 octane.
What does the NSR Chopacabra idle like?
The 108 degree lobe separation and 106 degree intake centerline give maximum overlap, so the idle is choppy and rowdy. Texas Speed says the cam does this without hurting low-speed drivability.
Is a tune required after installing the NSR Chopacabra cam?
Yes. A custom tune is required after any camshaft swap so the engine idles and runs correctly with the new profile, and on Gen IV 6.0L engines with AFM the tune must address cylinder deactivation if the lifters are changed.
