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ATK

LSXceleration 550HP 370CI 6.0L LQ4 Long Block w/ CNC Cathedral Port Heads By ATK

PART NUMBER:
54-LQ4-LB-1
MPN:
54-LQ4-LB-1
Availability:
2-4 Week Lead Time
Shipping:
Free Over $98 In U.S. 48
Type:
Long Blocks
Engine Balance:
Internal
Block:
GM 6.0L Iron Gen III LQ4
Crankshaft:
OE reground
Crankshaft Reluctor:
24x
Crankshaft Stroke (in.):
3.622
Rods:
Scat I beam 6.125”
Rod Material:
4340 Forged
Main Studs Included:
No
Bolts:
ARP 8740
Piston Bore (in.):
4.030
Ring Material:
Moly
Compression Ratio:
10.3:1
Camshaft Included:
Hyd. Roller
Cam Specifications:
Custom performance grind
Electronics Inlcuded:
No
Cylinder Heads:
CNC ported Cathedral Port
Quantity:
Sold Individually
  • LSXceleration 550HP 370CI 6.0L LQ4 Long Block w/ CNC Cathedral Port Heads By ATK
  • LSXceleration 550HP 370CI 6.0L LQ4 Long Block w/ CNC Cathedral Port Heads By ATK
$8,663.71

Description

LSXceleration 550HP 370CI 6.0L LQ4 Long Block w/ CNC Cathedral Port Heads By ATK

This is an LQ4 based engine with LS3 Aluminum heads making a very streetable 550HP+. Expect big mid to upper end power, will have a noticeable idle. For optimal Performance you will need headers, chassis dyno tune and 36lb injectors. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance.

Engine Specifications:
• HP: 550
• TQ: 490
• Block: GM 6.0L Iron Gen III LQ4
• Bore/Stroke: 4.030” x 3.622”
• Displacement (cu.in): 370
• Crankshaft: OE reground 3.622” internally balanced 24 tooth
• Rods: Scat 4340 forged I beam 6.125” with ARP 8740 bolts
• Pistons: Manley forged 10.3:1 compression
• Rings: Moly
• Camshaft: Hyd. Roller
• Cam Specs: Custom performance grind
• Lifters: GM LS7
• Timing Chain: Billet HD .250” roller
• Cylinder Heads: GM LS3 aluminum 68.4cc/260cc 2.165”/1.590” valves
• Rocker Arms: OE 1.7 ratio
• Oil Pump: Melling

Recommended Components:
• Flexplate/Flywheel: Stock internally balanced
• Balancer: Stock internally balanced/per application
• Intake Manifold: Stock/Aftermarket EFI intake or Carbureted setup
• Water Pump: Per application
• Fuel Pump: Electric per application
• Fuel Injectors: 36lb injectors
• Spark Plugs: NGK #3186
• Spark Plug Wires: Factory

Engine Info:
• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K&N
• Timing: Set to factory specifications via PCM module (ECM TUNING REQUIRED).
• Spark Plug Gap: .040”
• Firing Order: 18726543
• Octane: 91+
• Stall Converter: 2500+
• Exhaust: 1 5/8 + Headers

Notes: This engine can be used as an upgrade for the 2001-2007 Chevy trucks with the LQ4 6.0L or swapped into many other applications. ECM MUST BE TUNED, not doing so can damage the engine. : A PCV valve must be ran; please follow the valve cover instructions provided. You must also run an Air-Oil separator system such as the Moroso #85487 to capture the excess crankcase vapors LS engines are known for. If you are not running a MAP Sensor, the MAP timing option in the timing control box must be zeroed out all the way across. Failure to do so will allow the controller to add timing which can lead to detonation. You must also run some sort of a steam line kit that dumps to your water pump, radiator or radiator hose; we recommend a 4 corner setup like the Trick Flow #TFS-306SB601. This allows air pockets/hot spots to escape the heads and can also be used to purge out trapped air when filling the radiator for the first time.

Disclaimer: The recommended components to be used to obtain the power figures listed can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. We reserve the right to substitute parts used in engines if necessary.

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Warranty Information

DEFINITIONS: Long Block: As used in this warranty refers to (basic block, cylinder head, valve train, internal components and sheet metal) as supplied by ATK, including those parts and accessories as supplied by ATK. Short Block: As used in this warranty refers to (basic block, crankshaft, connecting rods and pistons) as supplied by ATK, including those parts and accessories as supplied by ATK. Short Block’s carry a 90 day warranty from the date of sale with no provision for labor claims. Engines Built for Forced Induction/Racing Purposes/Elite Series: These engines will be noted as such. They will carry a limited warranty of 6 months against manufactures defects covering PARTS ONLY. TERMS: Stage I, II, and Stage III Warranty For Engines: These warranties shall exist for 24 months or unlimited miles. Warranty term begins on date of sale. Engines used in marine applications that are not cataloged as such carry no warranty whatsoever. Marine Engines Carry an 18 Month Unlimited Hour Warranty. Please refer to www.atkvege.com for detailed Marine Engine Warranty Documentation. Standards: Subject to the limitations listed herein. ATK, at its option, shall repair or replace a product within the warranty term after determination by ATK that the product is defective due to parts and/or workmanship. All products are to be returned to ATK for inspection. Products not returned to ATK will not be warranted. All repairs and/or replacements covered by this warranty must be authorized by ATK. Unauthorized repairs will not be paid. Limitations: This warranty applies to products originally supplied by ATK. This warranty does not apply to or include any of the following: Any product used for competition, racing or related purposes. Damage as a result to installer error. Damage resulting from OVERHEATING, LACK OF LUBRICATION, or CONTAMINATION. Damage resulting from PRE-IGNITION or DETONATION. This includes but is not limited to: melted or broken piston, broken piston rings, damaged cylinder heads, leaking head gaskets, etc. Foreign objects entering the cylinder creating damage to pistons, cylinder walls, etc. Broken crankshafts, broken connecting rods, broken or damaged piston rings, broken valve train resulting from excessive R.P.M. A crankshaft thrust surface that is worn due to excessive forward pressure placed on the rear of the crankshaft. Repair or replacement required as a result of any accident or misuse. Repair or replacement of any accessory or service item, including specifically but not limited to: all components of the cooling, fuel, electrical, and ignition systems including belts, hoses, and filters. Replacement of any aftermarket part used in the engine. ATK is not responsible for defective parts supplied by aftermarket companies that may have been used in the build process such as (Distributors, Carburetors, Lifters/Valve Train, Water Pumps, Fuel Pumps, and Oil Pumps etc.) Most of the parts will carry there own warranty through the proper vendor. When an engine is purchased with the optional Dyno Test and Tune session we are able diagnose a defective part at that time and will change it out until the problem no longer occurs. This will not insure a part is not defective and premature failure can still arise after the engine has left our facility. Disclaimers: Applications are not verified and are not legal for pollution controlled vehicles. Computer controlled vehicles may need updated ECM, Chips, Fuel Systems, Etc. Please verify application before ordering. HP/TQ Measurements vary slightly from engine to engine. Accordingly, power measurements are typically within +/- 3% on our dyno (your dyno sheets). ATK Reserves the right to substitute parts or change specifications on all products offered. All images are for illustrative purposes only. Actual engine may vary in color, dress level and components used. Limited Liability: ATK’s liability under this warranty is limited solely to the repair or replacement of defective product. ATK shall not be liable for any incidental, special, consequential or exemplary damages including but not limited to freight charges, rental cars, towing fees or for any service not expressly provided for herein, relating or arising from the ATK product. Limited Warranty: This warranty is given in lieu of all other warranties, expressed or implied, including any warranty of merchantability, or fitness for a particular purpose, on the part of ATK or the dealer installing the engine. No dealer nor any agent or employee thereof, is authorized to extend or modify this warranty. Governing Law and Venue: The terms and provisions of this Limited Warranty shall be governed by and construed according to the laws of the State of Illinois, without reference to its rules relating to the choice of law provisions. Any action at law, suit in equity or judicial proceeding for the enforcement of this Limited Warranty or any provision thereof shall be brought exclusively before the United States District Court for the Northern District of Illinois or any state court sitting in Cook County, Illinois. Labor for Stage I,II, and III Warranty: ATK authorized repairs will be compensated at a rate not to exceed the Mitchell Repair Manual’s published applicable flat rate schedule. Hourly rates for all authorized labor claims will be paid in accordance with the original installation rate, not to exceed $42.00 per flat rate hour and a maximum labor liability of $350.00 per occurrence. Do-it-yourself repairs and repairs performed by unlicensed repair facilities do not qualify for labor reimbursements. Additional Owner/User Obligations: Initial Startup: Initial Startup: Valves must be re-adjusted to manufacturer’s specifications. Due to various component designs, cylinder head re-torque may or may not be required in your particular application. Refer to factory shop manual for the proper procedure for your engine type. If for any reason you are unsure what action to take, please contact our customer service department via our toll free number at 800-421-3746. First service between 600-1000 miles after installation: Oil and filter must be changed, valves re-adjusted and cylinder heads re-torqued (refer to initial startup instructions). Failures to perform these basic operations may result in a voided warranty. *Not legal for sale or use on any pollution controlled vehicle*
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