The Texas Speed 408ci LQ9 Iron Stroker Short Block is a fully assembled 4.000" stroke combination built on a brand-new GM LQ9 6.0L cast iron block. With a 4.030" bore forged piston set the package displaces 408 cubic inches, and Texas Speed describes it as a proven foundation for high-performance Gen III LS builds. The block ships with oil and coolant plugs installed and the buyer selects a 24x or 58x reluctor.
Every major rotating part is picked from the ordering options: a 4.000" stroke forged crankshaft from Texas Speed, K1 or Callies, forged 4.030" pistons from Wiseco or CP in flat-top, dish and dome volumes, and one of nine 6.125" connecting rod sets. A TSP/ARP main stud kit, upgraded wrist pins and a TSP 1/2" 12-point head stud kit (which requires PRC aftermarket heads) are offered as upgrades. Twelve quarts of break-in oil are included, and Texas Speed notes expedite service may be available depending on parts.
Specifications
- Displacement: 408 cubic inches
- Block: New GM LQ9 6.0L cast iron Gen III block
- Stroke: 4.000"
- Bore: 4.030" standard forged piston sets
- Crankshaft: 4.000" stroke, selected at ordering (Texas Speed forged 4340 6-bolt, K1 forged, Callies Compstar 8-counterweight, Callies Ultra Billet 24x or 58x)
- Pistons: Forged 2618 4.030" bore sets selected at ordering (Wiseco or CP; -3cc and flat-top through -21cc dish and +5cc dome volumes; TSP exclusive Wiseco -10cc set)
- Connecting rods: 6.125" forged rods selected at ordering (Texas Speed Super H-beam, Super I-beam or billet Super I-beam; Callies Compstar, Compstar Xtreme, Ultra H-beam or Ultra Enforcer I-beam; BoostLine 3-pocket)
- Reluctor wheel: 24x, 58x or Callies billet 24x, selected at ordering
- Main fasteners: GM bolts or TSP/ARP main stud kit, selected at ordering
- Head stud option: None or TSP 1/2" 12-point head stud kit (requires PRC aftermarket heads)
- Wrist pins: Standard or upgraded (JE, Wiseco or CP specific), selected at ordering
- Block prep: Oil and coolant plugs pre-installed
- Head bolt note: Gen III block requires LS2/LS3-style head bolts
- Break-in oil: 12 quarts Royal Purple included
Kit Includes
- New GM LQ9 6.0L cast iron Gen III block, fully assembled with oil and coolant plugs installed
- 4.000" stroke forged crankshaft (selected at ordering)
- Forged 4.030" bore piston set with rings (selected at ordering)
- 6.125" connecting rod set (selected at ordering)
- Reluctor wheel, 24x or 58x (selected at ordering)
- Main stud kit or GM main bolts (selected at ordering)
- 1/2" head stud kit, if selected
- Wrist pin upgrade, if selected
- Royal Purple break-in oil, qty 12 (RYP-11487)
- Engine cradle, required for shipping (TSP-Cradle)
- Short block shipping crate, required for shipping (TSP-SDCrateSB)
Ordering Options
This engine assembly is built to order and requires the following selections when ordering: Crankshaft, Pistons, Rods, Reluctor Wheel, Main Stud Kit (GM bolts or TSP/ARP studs), Optional 1/2" Head Stud Kit (or none), Upgraded Wrist Pins (or none). Texas Speed can provide an itemized quote and current build time for custom configurations.
Note: Gen III blocks use LS1/LS6-style covers and components but require LS2/LS3-style head bolts. Choose head fasteners accordingly.
Note: The optional 1/2" ARP head stud upgrade requires PRC aftermarket cylinder heads.
Vehicle Applications
Vehicle list reflects the GM LS-powered applications Texas Speed publishes for this engine assembly. Confirm reluctor wheel (24x or 58x), crankshaft snout, timing cover, oil pan and accessory compatibility for the vehicle before ordering.
Chevrolet Camaro
- 1998 Chevrolet Camaro
- 1999 Chevrolet Camaro
- 2000 Chevrolet Camaro
- 2001 Chevrolet Camaro
- 2002 Chevrolet Camaro
- 2010 Chevrolet Camaro
- 2011 Chevrolet Camaro
- 2012 Chevrolet Camaro
- 2013 Chevrolet Camaro
- 2014 Chevrolet Camaro
- 2015 Chevrolet Camaro
Chevrolet Corvette
- 1997 Chevrolet Corvette
- 1998 Chevrolet Corvette
- 1999 Chevrolet Corvette
- 2000 Chevrolet Corvette
- 2001 Chevrolet Corvette
- 2002 Chevrolet Corvette
- 2003 Chevrolet Corvette
- 2004 Chevrolet Corvette
- 2005 Chevrolet Corvette
- 2006 Chevrolet Corvette
- 2007 Chevrolet Corvette
- 2008 Chevrolet Corvette
- 2009 Chevrolet Corvette
- 2010 Chevrolet Corvette
- 2011 Chevrolet Corvette
- 2012 Chevrolet Corvette
- 2013 Chevrolet Corvette
Cadillac CTS-V
- 2004 Cadillac CTS-V
- 2005 Cadillac CTS-V
- 2006 Cadillac CTS-V
- 2007 Cadillac CTS-V
Cadillac Escalade
- 2005 Cadillac Escalade
- 2008 Cadillac Escalade
- 2009 Cadillac Escalade
- 2010 Cadillac Escalade
- 2011 Cadillac Escalade
- 2012 Cadillac Escalade
- 2013 Cadillac Escalade
- 2014 Cadillac Escalade
Pontiac Firebird
- 1998 Pontiac Firebird
- 1999 Pontiac Firebird
- 2000 Pontiac Firebird
- 2001 Pontiac Firebird
- 2002 Pontiac Firebird
Pontiac G8
- 2008 Pontiac G8
- 2009 Pontiac G8
Pontiac GTO
- 2004 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 SS
- 2014 Chevrolet SS
- 2015 Chevrolet SS
- 2016 Chevrolet SS
- 2017 Chevrolet SS
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 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
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
Vehicle applications reflect the fitment published by Texas Speed & Performance for this part number. Confirm your engine and cylinder head configuration before ordering.
FAQ
How does the Texas Speed 408ci LQ9 short block reach 408 cubic inches?
It pairs a 4.000" stroke forged crankshaft with 4.030" bore forged pistons in a brand-new GM LQ9 6.0L iron block. The longer stroke over the factory 3.622" is what adds the displacement.
Which crankshafts are offered for the 408 LQ9 short block?
Texas Speed lists its own forged 4340 6-bolt 4.000" crank, a K1 forged 4.000" LS1 crank, a Callies Compstar 8-counterweight wet-sump crank and Callies Ultra Billet cranks in 24x or 58x versions. The crank is chosen from the Crankshaft option at ordering.
Should I choose a 24x or 58x reluctor wheel?
The reluctor wheel is a required selection. Choose 24x for 1997 to 2006 style Gen III electronics (LS1, LS6, LQ4, LQ9 and similar), or 58x for 2007 and newer Gen IV electronics. Texas Speed also lists a Callies billet 24x reluctor as an upgrade on most builds.
What connecting rods can be selected?
Nine 6.125" rod sets are offered: Texas Speed Super H-beam, Super I-beam with ARP L19 bolts and billet Super I-beam; Callies Compstar H-beam, Compstar Xtreme power-adder H-beam, Ultra H-beam and two Ultra Enforcer I-beam versions; and BoostLine 3-pocket rods with ARP 2000 bolts. The rod is chosen from the Rods option when ordering.
What is the optional 1/2" head stud upgrade?
Texas Speed offers an upgrade to 1/2" ARP head studs, including the machine work the block needs, for high boost or nitrous combinations. TSP notes the upgrade requires PRC aftermarket cylinder heads, which already have the larger bolt holes for 1/2" studs.
Is break-in oil included with Texas Speed engine assemblies?
Yes. Texas Speed includes Royal Purple break-in oil with every engine assembly. TSP stresses that proper break-in oil with ZDDP additives matters for ring seal on first start-up and recommends an engine priming pre-lube tank before initial fire-up.
