The Texas Speed 347 to 398ci Resleeved Gen IV Aluminum LS Long Block is a built-to-order engine assembly that starts with a new Gen IV aluminum block fitted with Power Bore or Darton dry sleeves, which Texas Speed states have much higher tensile strength and are much thicker than the sleeves in a GM block. Every block is machined and assembled at the Texas Speed engine facility. This listing covers all 3.622" stroke combinations, from a 3.903" bore 347 up to a 4.185" bore 398, and Texas Speed recommends the 3.622" and 4.00" stroke versions for power-adder builds.
The buyer configures the engine at ordering with a crankshaft, 6.125" connecting rods, Wiseco or CP 2618 forged pistons with lowered ring lands for nitrous or boost, PRC cylinder heads, head bolts or studs, head gaskets, main studs, oil pump, rocker arms, timing set, balancer bolt and reluctor wheel. Oil and coolant plugs come installed. Texas Speed offers a 1/2" head stud upgrade with the required machine work for heavy nitrous or boost, and an optional LS2 conversion package for installing the engine in an LS1 vehicle. Twelve quarts of break-in oil are included, and the engine ships by truck freight with the final freight cost quoted after the order.
Specifications
- Displacement: 347 to 398 cubic inches depending on bore (3.622" stroke)
- Bore and stroke combinations per Texas Speed: 3.903" = 347, 4.005" = 365, 4.01" = 366, 4.03" = 370, 4.07" = 377, 4.100" = 382, 4.125" = 387, 4.155" = 393, 4.185" = 398 cubic inches
- Block: New Gen IV aluminum LS block (GM Gen IV 5.3L block selected at ordering, or customer supplied)
- Sleeves: Power Bore or Darton dry sleeves, selected at ordering; Power Bore sleeves not available below a 4.07" bore
- Stroke: 3.622" (Callies options at 3.625")
- Crankshaft: Texas Speed forged 3.622", K1 Technologies forged 3.622", GM 3.622", GM 6.2L LSA 8-bolt 2009 to 2011, Callies Compstar 3.625", Callies Magnum 3.625" or Callies Ultra billet 3.625" wet or dry sump, selected at ordering
- Connecting rods: 6.125" H-beam or I-beam sets from Texas Speed, Callies or BoostLine, selected at ordering
- Pistons: Wiseco 4.125" -1cc flat top or CP-Carrillo 4.125" -13.3cc dish, 2618 forgings with lowered ring lands, 1.300" compression height, selected at ordering (other bore sizes per Texas Speed)
- Cylinder heads: PRC 225cc, 227cc, 237cc, 247cc, 260cc LS3, LS3 as-cast, 265cc LS7 or 285cc LS7, selected at ordering
- Head fasteners: ARP hex head bolts, ARP 8740 12-point studs or TSP 1/2" 12-point studs with machine work, selected at ordering
- Head gaskets: TSP LS .040", .051" or .060", selected at ordering
- Main studs: TSP/ARP main stud kit or GM main bolts, selected at ordering
- Rocker arms, timing set, oil pump, balancer bolt and reluctor wheel (24x or 58x): selected at ordering
- Recommended maximum bore with a power adder: 4.125"
- Break-in oil: 12 quarts included; Texas Speed recommends Driven HR2 conventional oil after break-in
- Shipping: Truck freight; final freight cost quoted by Texas Speed after ordering
Kit Includes
- New Gen IV aluminum LS block, resleeved and machined (GM Gen IV 5.3L block selected at ordering, or customer supplied)
- Power Bore or Darton dry sleeves (selected at ordering)
- Crankshaft, 3.622" or 3.625" stroke (selected at ordering)
- Connecting rod set, 6.125" (selected at ordering)
- Forged piston set, Wiseco or CP-Carrillo (selected at ordering)
- Upgraded wrist pins, or none (selected at ordering)
- Reluctor wheel, 58x or 24x (selected at ordering)
- Harmonic balancer bolt, ARP or GM (selected at ordering)
- PRC cylinder heads (selected at ordering)
- Head bolts or head studs (selected at ordering)
- Head gaskets, .040", .051" or .060" (selected at ordering)
- Main stud kit or GM main bolts (selected at ordering)
- Oil pump, Melling high pressure or high volume (selected at ordering)
- Rocker arms (selected at ordering)
- Timing set, Rollmaster LS2 1x or LS3 4x (selected at ordering)
- Oil and coolant plugs, installed
- Royal Purple break-in oil (RYP-11487), 12 quarts
- Engine cradle required for shipping (TSP-Cradle)
- Shipping crate required for shipping (TSP-SDCrateSB)
Ordering Options
Fifteen selections are required when ordering: Pistons (Wiseco 4.125" -1cc flat top or CP-Carrillo 4.125" -13.3cc dish), Rods (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, or BoostLine 3-pocket), Upgraded Wrist Pins (HD tool steel for Wiseco, .230" wall for CP, JE HD .200 wall, or none), Engine Block (customer supplied or new GM Gen IV 5.3L block), Balancer Bolt (ARP or GM), Crankshaft, Cylinder Heads (PRC 225cc through 285cc LS7), Cylinder Sleeves (Power Bore or Darton), Head Bolts/Studs, Head Gaskets (.040", .051" or .060"), Main Stud Kit (TSP/ARP studs or GM bolts), Reluctor Wheel (58x or 24x), Oil Pump (Melling high pressure or high volume), Rocker Arms (GM LS1, LS3 or LS7 sets with TSP trunnion or CHE bushing upgrades, or TSP steel 1.72 and LS7 1.82 roller rockers) and Timing Set (Rollmaster LS2 1x or LS3 4x). Texas Speed also offers an optional LS2 conversion package for LS1 vehicles; call for an itemized estimate.
Note: Power Bore sleeves are not available below a 4.07" bore size. Texas Speed does not recommend running larger than a 4.125" bore with any type of power adder.
Note: An LS2 conversion package (LS2 timing cover with cam sensor, LS2 valley cover, LS2 lifter trays, LS2-specific timing set and plug-and-play harness extensions for the cam position and knock sensors) is required when installing this engine in an LS1 vehicle and is offered by Texas Speed as an option.
Note: All engines ship via truck freight. Online shipping costs are not correct for this item; Texas Speed contacts the buyer with the freight cost after the order is placed.
Note: Twelve quarts of break-in oil are included. Texas Speed stresses proper break-in oil and procedures for ring seal, and recommends Driven HR2 conventional oil once break-in is complete.
Vehicle Applications
Built on a Gen IV aluminum LS block for Gen III and Gen IV LS-powered vehicles and LS swaps. LS1 vehicles require the optional LS2 conversion package; confirm 24x or 58x reluctor for the target vehicle.
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
- 2008 Cadillac CTS-V
- 2009 Cadillac CTS-V
- 2010 Cadillac CTS-V
- 2011 Cadillac CTS-V
- 2012 Cadillac CTS-V
- 2013 Cadillac CTS-V
- 2014 Cadillac CTS-V
- 2015 Cadillac CTS-V
Cadillac Escalade
- 2002 Cadillac Escalade
- 2003 Cadillac Escalade
- 2004 Cadillac Escalade
- 2005 Cadillac Escalade
- 2006 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
- 2009 GMC Sierra 2500
- 2010 GMC Sierra 2500
- 2011 GMC Sierra 2500
- 2012 GMC Sierra 2500
- 2013 GMC Sierra 2500
- 2014 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
- 2009 GMC Sierra 3500
- 2010 GMC Sierra 3500
- 2011 GMC Sierra 3500
- 2012 GMC Sierra 3500
- 2013 GMC Sierra 3500
- 2014 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
- 2008 Chevrolet Silverado 2500
- 2009 Chevrolet Silverado 2500
- 2010 Chevrolet Silverado 2500
- 2011 Chevrolet Silverado 2500
- 2012 Chevrolet Silverado 2500
- 2013 Chevrolet Silverado 2500
- 2014 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
- 2008 Chevrolet Silverado 3500
- 2009 Chevrolet Silverado 3500
- 2010 Chevrolet Silverado 3500
- 2011 Chevrolet Silverado 3500
- 2012 Chevrolet Silverado 3500
- 2013 Chevrolet Silverado 3500
- 2014 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
Chevrolet Trailblazer SS
- 2006 Chevrolet Trailblazer SS
- 2007 Chevrolet Trailblazer SS
- 2008 Chevrolet Trailblazer SS
- 2009 Chevrolet Trailblazer SS
Pontiac Trans Am
- 1998 Pontiac Trans Am
- 1999 Pontiac Trans Am
- 2000 Pontiac Trans Am
- 2001 Pontiac Trans Am
- 2002 Pontiac Trans Am
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
What is included in the Texas Speed 347 to 398ci Resleeved Gen IV LS engine?
The assembly includes a new Gen IV aluminum block with Power Bore or Darton dry sleeves, plus the crankshaft, 6.125" rods, forged pistons, reluctor wheel, balancer bolt, PRC cylinder heads, head fasteners, head gaskets, main studs or bolts, oil pump, rocker arms and timing set selected at ordering. Oil and coolant plugs are installed and 12 quarts of break-in oil, a cradle and a crate are included.
What displacements can this 3.622" stroke engine be built to?
Texas Speed lists nine bore sizes on the 3.622" stroke: 3.903" for 347ci, 4.005" for 365, 4.01" for 366, 4.03" for 370, 4.07" for 377, 4.100" for 382, 4.125" for 387, 4.155" for 393 and 4.185" for 398 cubic inches. Power Bore sleeves are only available from 4.07" up.
Which stroke should I choose for a boosted or nitrous build?
Texas Speed recommends the 3.622" and 4.00" stroke versions for power-adder applications and advises keeping the bore at 4.125" or smaller with boost or nitrous. The 4.10" and 4.125" stroke engines are recommended for naturally aspirated use only.
Will this engine work in an LS1 vehicle such as a 1998 to 2002 Camaro or C5 Corvette?
Yes, with the optional LS2 conversion package Texas Speed offers. It adds the LS2 timing cover with cam position sensor, LS2 valley cover, lifter trays, LS2-specific timing set and harness extensions needed for a Gen IV block in a Gen III vehicle, and a 24x reluctor should be selected.
Why are the Power Bore and Darton sleeves better than the factory GM sleeves?
Texas Speed states the Power Bore and Darton dry sleeves have much higher tensile strength and are much thicker than the sleeves used in GM blocks, which lets the block hold a larger bore and more power. Every resleeved block is machined and assembled at the Texas Speed facility.
Is a 1/2" head stud upgrade available?
Yes. Texas Speed offers a TSP 1/2" 12-point head stud kit for large nitrous or boost applications. Its price includes the ARP hardware and the machine work to the block, and the PRC aftermarket heads already have the larger bolt holes to accept 1/2" studs.
