Eldorado Northstar Engines
from £6,800 to £9,400
Rebuilt units from £6,800 · Common codes: LD8, L37, Northstar 4.6L
Cadillac ENGINE MARKETPLACE
Cadillac Eldorado Engine Replacement - Compare Quotes from UK Specialists
Get quotes from trusted UK Cadillac Eldorado engine specialists. Compare reconditioned and rebuilt prices for L37, LD8, and L26 - 4.6L to 4.9L Northstar V8 covered. Get specialist quotes for your Eldorado.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Eldorado HT4100 Engines
from £4,200 to £6,100
Rebuilt units from £4,200 · Common codes: HT4100, 4.1L V8, Digital FI
Eldorado Big-Block Engines
from £8,400 to £15,000
Rebuilt units from £8,400 · Common codes: 472ci, 500ci, L26 425ci
Instant engine replacement quote - 100% free, no obligation
Engine replacement near me - UK-wide specialist network
Compare reconditioned, rebuilt & used engine prices
Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Cadillac Eldorado Replacement Engineto Finding the Best Cadillac Eldorado Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
Average Market Prices
No entries match that model filter yet.
↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Cadillac Eldorado Owners Across the UK
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Cadillac Eldorado engines through EngineMarket.
4.8
★★★★★
out of 5
1,081 verified reviews
★★★★★
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
JJimmyGoogle
★★★★★
“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
PPeteFacebook
★★★★★
“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
SSophieTrustpilot
★★★★★
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
JJimmyGoogle
Variants We Cover
Cadillac Eldorado Engine ReplacementAll Variants Covered
Cadillac Eldorado Northstar LD8
LD8 4.6L Petrol
Rebuilt Engines: £6,800-£9,400
Cadillac Eldorado Northstar L37
L37 4.6L Petrol
Rebuilt Engines: £7,400-£9,800
Cadillac Eldorado HT4100
HT4100 4.1L Petrol
Rebuilt Engines: £4,200-£6,100
Cadillac Eldorado 472ci Big-Block
472ci 7.4L Petrol
Rebuilt Engines: £8,400-£10,200
Cadillac Eldorado 500ci Big-Block
500ci 8.2L Petrol
Rebuilt Engines: £10,200-£15,000
Cadillac Eldorado L26 425ci
L26 7.0L Petrol
Rebuilt Engines: £7,800-£9,600
Cadillac Eldorado Coupe
LD8/L37/HT4100 4.6L Petrol
Rebuilt Engines: £4,200-£9,400
Cadillac Eldorado Convertible
LD8/L37/HT4100 4.6L Petrol
Rebuilt Engines: £4,200-£9,800
Cadillac Eldorado ETC Performance
L37 4.6L Petrol
Rebuilt Engines: £7,400-£9,800
Cadillac Eldorado Touring Coupe
LD8/L37 4.6L Petrol
Rebuilt Engines: £6,800-£9,400
Cadillac Eldorado Platinum Edition
L37 4.6L Petrol
Rebuilt Engines: £8,200-£10,500
Cadillac Eldorado RHD Conversion
LD8/L37/HT4100 4.6L Petrol
Rebuilt Engines: £4,200-£9,800
Not sure which variant your Cadillac Eldorado is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
Eldorado
Engine Codes
Cadillac Eldorado Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Cadillac Eldorado across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Petrol Engines
Extracted from detailed petrol and performance engine families across Cadillac Eldorado variants.
LD8 - 4.6L Petrol
Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
Compatible variants
CoupeConvertibleTouring CoupeBase Trim
Avg. rebuilt price
£6,800 - £9,400
Supply only
Technical specifications
- Fuel type
- Petrol
- Engine size
- 4.6L
- Power output
- 270-279 hp
- Years fitted
- 1992-2002
Common failures
- ●Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Cadillac Eldorado engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
Eldorado
Common Problems
Cadillac Eldorado Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The Cadillac Eldorado's engine reliability varies significantly by generation: Northstar 4.6L V8s (1992-2002) dominate UK replacement demand due to head bolt thread failures, while HT4100 4.1L units (1982-1987) suffer head gasket coolant intrusion, and big-block 472/500ci engines (1968-1976) face valve guide wear at high mileage. Every rebuilt engine...
Northstar Head Bolt Thread Failure - Why Cadillac Eldorado LD8/L37 Engines Fail Prematurely
Northstar Head Bolt Thread Failure
Most affected vehicles
Cadillac Eldorado CoupeConvertible
Cadillac Eldorado Coupe, Convertible, Touring, ETC, Platinum (1992-2002, LD8 & L37 Northstar 4.6L DOHC V8)
Failure mileage range
100,000-140,000 miles
Typical failure window
Root cause
Aluminium cylinder block head bolt threads pull out under thermal cycling and torque load, causing head gasket failure, coolant loss and overheating.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Timesert Insert Installation | £2,800 - £4,200 | £1,800 - £2,900 | Remove cylinder heads, install Timesert threaded inserts per Cadillac TSB 98-T-006, renew head gaskets and bolts | Viable only if caught before catastrophic thread pull-out; extends engine life 50-80k miles if cooling system maintained |
| Intermediate - Cylinder Head Reconditioning + Timesert | £4,500 - £6,800 | £3,200 - £4,900 | Full head reconditioning, Timesert installation, valve service, new gaskets, coolant system flush and component inspection | Suitable for engines with good block condition; addresses head-side failures but not block wear |
| Full Replacement - Rebuilt / Reconditioned Northstar Engine | £9,200 - £13,500 | £6,800 - £9,400 | Complete rebuilt engine with Timesert head bolt repair as standard, upgraded water pump, silicone hoses, bench-tested, 12-month warranty | Best value for engines with block wear, high mileage, or multiple failure points; supply & fit available nationwide |
Our recommendation
On a Cadillac Eldorado Northstar showing early overheating or coolant loss at 100k+ miles, a preventative Timesert repair can be cost-effective if the block is sound. However, if thread pull-out has occurred or the engine has suffered overheating damage, a full rebuilt unit with Timesert repair included offers better long-term value and warranty protection.
Compare rebuilt Northstar LD8/L37 engine prices for your Cadillac EldoradoReplacement Engine Options
Cadillac Eldorado Engine TypesOptions, Costs & What to Expect
Every Cadillac Eldorado engine type is available through our UK network with typical price ranges based on variant, engine code and budget for US-import classics.
Cadillac Eldorado Reconditioned Engines (Recon)£4,200 - £12,000((supply only))
Cadillac Eldorado Rebuilt Engines£6,800 - £15,000((supply only))
Cadillac Eldorado Used Engines£2,800 - £8,400((supply only))
Cadillac Eldorado Remanufactured Engines£9,200 - £18,000((supply only))
Cadillac Eldorado Refurbished Engines£3,400 - £7,200((supply only))
Compare Cadillac Eldorado engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Cadillac Eldorado within hours.
Engine Sizes
Cadillac Eldorado Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Cadillac Eldorado is listed below, with compatible engine codes, production years and common failure notes for US-import classics.
The 4.1L HT4100 digital fuel injection V8 powered the transitional 1982-1987 Eldorado generation, offering improved efficiency for its era but suffering head gasket failures that define replacement demand for these classics.
⚙
Engine Code(s)
HT4100
▣
Compatible Models (UK)
Coupe (1982-1987), Convertible
ϟ
Power output
Verified by registration
△
Common Failure Points
Head gasket coolant intrusion at 90k miles, plastic thermostat housing crack, digital FI calibration drift
Production Years: 1984-1987
Compare Cadillac Eldorado 4.1L petrol engine pricesFuel Type
Cadillac Eldorado Engines by Fuel Type
Choose your Cadillac Eldorado engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early 472ci big-block to the latest Northstar 4.6L twin-cam.
Cadillac Eldorado Petrol Engines
PetrolAll Cadillac Eldorado variants were petrol-only, spanning classic OHV big-blocks (1968-1979), transitional digital FI (1982-1987), and modern DOHC Northstar twin-cams (1992-2002) for US-import classics.
Common Cadillac Eldorado Petrol Engine Families
- •LD8/L37 Northstar 4.6L DOHC - most common replacement engine (1992-2002), head bolt thread failure risk
- •HT4100 4.1L Digital FI - transitional era (1982-1987), head gasket coolant intrusion pattern
- •472ci/500ci Big-Block OHV - collector heritage engines (1968-1976), valve guide wear at high mileage
Found In
- •Personal Luxury Era (1967-1978) - 472ci/500ci big-block OHV V8
- •Downsized Era (1979-1985) - L26 425ci OHV V8
- •Digital FI Era (1982-1987) - HT4100 4.1L digital fuel injection V8
Known For
- •Massive low-end torque from big-block OHV V8s for classic American cruising character
- •Northstar head bolt thread failure in aluminium block at 120k miles dominates UK replacement enquiries
- •HT4100 head gasket coolant intrusion requires MLS gasket upgrades during rebuild for longevity
Typical Petrol Models
- •Eldorado Coupe (all generations)
- •Eldorado Convertible (1971-1976, 1984-1987, 1992-2002)
- •Eldorado ETC Performance (1994-2002, L37 Northstar)
Cadillac Eldorado Petrol Engines
PetrolAll Cadillac Eldorado variants were petrol-only, spanning classic OHV big-blocks (1968-1979), transitional digital FI (1982-1987), and modern DOHC Northstar twin-cams (1992-2002) for US-import classics.
Common Cadillac Eldorado Petrol Engine Families
- •LD8/L37 Northstar 4.6L DOHC - most common replacement engine (1992-2002), head bolt thread failure risk
- •HT4100 4.1L Digital FI - transitional era (1982-1987), head gasket coolant intrusion pattern
- •472ci/500ci Big-Block OHV - collector heritage engines (1968-1976), valve guide wear at high mileage
Found In
- •Personal Luxury Era (1967-1978) - 472ci/500ci big-block OHV V8
- •Downsized Era (1979-1985) - L26 425ci OHV V8
- •Digital FI Era (1982-1987) - HT4100 4.1L digital fuel injection V8
Known For
- •Massive low-end torque from big-block OHV V8s for classic American cruising character
- •Northstar head bolt thread failure in aluminium block at 120k miles dominates UK replacement enquiries
- •HT4100 head gasket coolant intrusion requires MLS gasket upgrades during rebuild for longevity
Typical Petrol Models
- •Eldorado Coupe (all generations)
- •Eldorado Convertible (1971-1976, 1984-1987, 1992-2002)
- •Eldorado ETC Performance (1994-2002, L37 Northstar)
Not sure which fuel type your Cadillac Eldorado has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Cadillac Eldorado specialists.
Engine Years →
Cadillac Eldorado Engines by YearWhat Was Fitted & WhenCadillac Eldorado Engines by Year - What Was Fitted & When
This section covers all major engine changes across the Cadillac Eldorado's production timeline (1968-2002), organised so UK import owners can quickly identify their engine and compare rebuilt prices from specialists.
⚙Key Changes
- ✓1968: Introduction of 472ci (7.4L) OHV big-block V8, replacing previous smaller units
- ✓1970: Launch of ultimate 500ci (8.2L) big-block V8 for peak torque and collector appeal
▣Main Engines
▰Popular Models
🔧Known For
Engine Codes Covered:
Not sure which year your Cadillac Eldorado was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Cadillac Eldorado specialists.
FAQ