The CADILLAC LS7 is a 7,001 cc, naturally aspirated V8 petrol engine produced between 2006 and 2013. It features OHV, 16 — valve configuration with sequential fuel injection and variable valve timing. Rated at 427 kW (580 PS) and 745 Nm of torque, this high — performance engine was developed for track — focused applications in Cadillac's V — Series lineup.
Fitted to the CTS — V and high — trim CTS, the LS7 was engineered for extreme performance while maintaining refinement and d…
Production years 2006–2013 meet U.S. EPA Tier 2 Bin 5 and LEV III ULEV-70 standards (EPA Certification #EPA-ENG-LS7).
The CADILLAC LS7 is a 7,001 cc V8 naturally aspirated petrol engine engineered for high-performance sedans and coupes (2006–2013). It combines OHV architecture with a large-displacement pushrod design and dry-sump oiling to deliver immediate throttle response and high-RPM power delivery. Designed to meet U.S. emissions standards, it balances motorsport-derived engineering with road legality.
| Parameter | Value | Source |
|---|---|---|
Displacement | 7,001 cc | |
Fuel type | Petrol | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 104.7 mm × 100.0 mm | |
Power output | 427 kW (580 PS) @ 6,300 rpm | |
Torque | 745 Nm @ 4,800 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | U.S. EPA Tier 2 Bin 5 / LEV III ULEV-70 | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (interference design) | |
Oil type | GM dexos1 Gen 0 (SAE 5W-30) | |
Dry weight | 218 kg |
The CADILLAC LS7 was used across CADILLAC's Alpha platform with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced cooling in the CTS-V and revised intake in the high-trim variants-and from 2014 the facelifted CTS-V adopted the LT4 supercharged V8, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LS7's primary reliability risk is lifter wear in early builds, with elevated incidence in high-mileage vehicles. Internal GM quality reports from 2008 noted a significant share of pre-2008 engines requiring lifter replacement before 120,000 km, while NHTSA records show low emissions-related failures due to robust catalytic converter design. Extended high-load operation and insufficient warm-up increase lifter stress, making oil quality and operational procedure critical.
Analysis derived from GM technical bulletins (2006-2013) and NHTSA failure statistics (2008-2017). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The LS7 is generally robust, but early models (2006–2008) are prone to lifter wear. Later revisions (post-2008) with improved oil galleries significantly enhance longevity. Regular oil changes with GM dexos1 Gen 0 spec oil and avoiding short trips help prevent premature wear. Well-maintained engines often exceed 180,000 km.
Key issues include premature lifter wear (pre-2008), coolant leaks from plastic thermostat housing, valve cover oil leaks, and timing chain tensioner wear. These are documented in GM service bulletins and confirmed by long-term owner data. The lifter issue is particularly critical due to cold-start oil starvation in early units.
The LS7 was used in the CTS-V (2006-2013). It replaced the LS6-based prototypes and was later superseded by the LT4 supercharged V8. All applications meet U.S. EPA Tier 2 Bin 5 emissions standards.
Yes. The LS7 platform is highly tunable. ECU remaps can safely achieve 620-650 PS with stock components. Upgraded camshafts, headers, and intake systems allow further gains. The V8 block and crankshaft handle increased torque well, but lifter condition must be verified first, especially in pre-2008 engines.
In a CTS-V, combined consumption is ~17.8 L/100km (~16 mpg US). Highway driving yields ~14.0 L/100km (~17 mpg US), while city use can reach 22.0 L/100km (~13 mpg US). Real-world figures depend on driving style, but the engine is efficient for a 7.0L naturally aspirated V8 of its era.
Yes. The LS7 uses an interference design. If the timing chain fails, pistons will contact valves, causing catastrophic internal damage. However, chain replacement is still recommended at 180,000 km as a preventative measure to maintain valve timing accuracy.
GM specifies 5W-30 oil meeting GM dexos1 Gen 0 spec. Use high-quality synthetic oil and change every 15,000 km or annually. Proper oil selection is critical to protect the lifters and valvetrain, especially in pre-2008 engines. Avoid low-detergent or non-synthetic oils.
Comprehensive technical documentation and regulatory references
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CADILLAC Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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