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MG MGC Engine ReplacementRebuilt & Performance Options Available

Get quotes from trusted UK MG MGC engine specialists. Compare rebuilt and performance reconditioned prices for 29G and C-Series - 3.0L straight-6 covered. Find UK performance engine specialists.

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MG MGC C-Series engine replacement - 29G 29H rebuilt reconditioned UK
MG MGC C-Series Engines- from £5,000 to £15,000

Rebuilt units from £5,000

Common codes: C-Series

MG MGC 29G engine replacement - high compression rebuilt reconditioned UK specialist
MG MGC 29G High Compression- from £7,500 to £15,000

Rebuilt units from £7,500

Common codes: 29G, 29G-HC, C-Series-29G

MG MGC 29H engine replacement - low compression rebuilt reconditioned UK
MG MGC 29H Low Compression- from £5,000 to £12,000

Rebuilt units from £5,000

Common codes: 29H, 29H-LC, C-Series-29H

MG MGC engine replacement UK - compare reconditioned and rebuilt engine prices
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3 Simple Stepsto Finding the Best MG C Replacement Engine

12-Month Warranty
Supply & Fit Available
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Most replacements completed within 3-5 days.

Engine Intelligence

MG MGC Engines - Codes, Common Failures & Replacement Costs

The cards below cover the C-series straight-6 engines fitted to the MG MGC in the UK, including documented failure causes, variant production years, and typical rebuilt engine costs based on current UK market data.

MG C engine intelligence reference

29G

Production History

  • MG MGC GT (1967-1969)
  • MG MGC Roadster (1967-1969)

Known Failures

  • Timing chain tensioner failure - catastrophic failure risk if original tensioner not upgraded, often requires full rebuild.
  • Crankshaft vibration - three-bearing design can cause high-speed vibration leading to premature wear.
  • Oil pump wear - low oil pressure common on high-mileage units, triggers replacement decisions.

Specs

Petrol · 2.9L · 145hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £7,500-£15,000 (supply only)

29H

Production History

  • MG MGC GT North American Export (1967-1969)
  • MG MGC Roadster North American Export (1967-1969)

Known Failures

  • Timing chain tensioner failure - same catastrophic weak point as 29G, requires urgent attention.
  • Head gasket failure - overheating or poor maintenance can lead to gasket breach and engine damage.
  • Water pump failure - frequent failure point causing overheating and potential engine seizure.

Specs

Petrol · 2.9L · 140hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £5,000-£12,000 (supply only)

C-Series

Production History

  • MG MGC GT UK Market (1967-1969)
  • MG MGC Roadster UK Market (1967-1969)
  • MG MGC Left Hand Drive Export (1967-1969)

Known Failures

  • Valve seat recession - lead-free conversion recommended for modern unleaded fuel compatibility.
  • Camshaft wear - flat tappet design susceptible to wear if oil quality or pressure is inadequate.
  • Piston ring wear - oil consumption and blue smoke indicate bottom-end wear requiring rebuild.

Specs

Petrol · 2.9L · 140-145hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £5,000-£15,000 (supply only) Estimated from comparable C-series units - actual quotes may vary.

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Variants We Cover

MG MGC Engine ReplacementAll Variants Covered

Not sure which variant your MG MGC is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.

Engine Codes

MG MGC Engine Codes

Every engine code fitted to the MG MGC 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 MG C variants.

Can't find your 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 MG MGC engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.

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Common Problems

MG MGC Engine Problems

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Save vs Main Dealer Price

Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific MG MGC and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.

Replacement Engine Options

MG MGC Replacement Engine Types

Every MG MGC engine type is available through our UK network with typical price ranges based on variant, engine code and budget.

MG MGC Refurbished EnginesPartial refresh of running C-series engines; addresses specific faults without full strip-down.
Typical Price
£4,000 - £9,000
(supply only)
View refurbished MG MGC engine options
Refurbished

Refurbished MG MGC engines target specific issues like tensioner upgrade, head gasket or oil pump without full rebuild.

  • Cost-effective for addressing known weak points
  • Suitable if block and crank are confirmed sound
  • Verify scope of work and warranty terms before purchase
Typical Price
£4,000 - £9,000
(supply only)
View refurbished MG MGC engine options

All rebuilt engines include a minimum 12-month 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 MG MGC within hours.

Engine Sizes

MG MGC Engines by SizeFind the Right Displacement for Your Variant

Every displacement fitted to the MG MGC is listed below, with compatible engine codes, production years and common failure notes to help you identify the correct replacement.

The 2.9-litre C-series straight-6 was the sole engine offered in the MG MGC across its 1967-1969 production run. This robust overhead-valve unit powered both GT and Roadster variants, with high-compression 29G and low-compression 29H codes determining performance and market destination.

ENGINE CODE(S)29G, 29H, C-Series
COMPATIBLE MODELS (UK)MG MGC GT (1967-1969), MG MGC Roadster (1967-1969), Export LHD variants
Common Failure Points

Timing chain tensioner collapse, three-bearing crankshaft vibration, oil pump wear on high-mileage units

Compare MG MGC 2.9L petrol engine prices

Not sure which engine size your MG MGC needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK MG MGC specialists.

Fuel Type

MG MGC Engines by Fuel Type

Choose your MG MGC engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the high-compression 29G to the export-spec 29H.

The MG MGC was exclusively petrol-powered, using the BMC C-series 2.9-litre straight-6 across all UK and export variants from 1967-1969.

Common MG MGC Petrol Engine Families
29G
High-compression UK-spec engine (145hp), most sought-after for performance and authenticity
29H
Low-compression export engine (140hp), common in North American imports and direct replacement option
C-Series (Generic)
Umbrella code used when specific compression variant is unknown or interchangeable
Found In
MG MGC GT (1967-1969)
29G (UK), 29H (Export)
MG MGC Roadster (1967-1969)
29G (UK), 29H (Export)
Known For
Notorious timing chain tensioner failure requiring urgent specialist attention
Three-bearing crankshaft design limits high-speed cruising due to vibration
Strong low-end torque and classic SU carburettor character when well maintained
Typical Petrol Models
MG MGC GTMG MGC RoadsterMG MGC GT Left Hand DriveMG MGC Roadster Left Hand DriveMG MGC Numbers Matching Restoration
Compare MG MGC Petrol engine prices

Not sure which fuel type your MG MGC 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 MG MGC specialists.

Engine Years

MG MGC Engines by YearWhat Was Fitted & When

This section covers all major engine changes across the MG MGC's 1967-1969 production timeline, organised so owners can quickly identify their C-series engine and compare rebuilt prices from UK specialists.

1967 - 1969 - MG MGC Production Run
Major Platform Change
The MG MGC was produced for just three model years with a single engine family, making year identification critical for parts compatibility and authenticity.
Key Changes
1967: Launch of MG MGC GT and Roadster with C-series 29G high-compression engine for UK market
FAQ

MG MGC Engine ReplacementFrequently Asked Questions

How much does an MG MGC engine replacement cost in the UK-

A professionally rebuilt MG MGC C-series engine typically costs £5,000-£15,000 supply-only, depending on specification, compression ratio and whether lead-free conversion is included.

  • 29G high-compression rebuilt units command premium pricing
  • 29H low-compression or generic C-Series often more affordable
  • Supply & fit service adds £1,500-£3,500 labour depending on specialist
  • Core exchange can reduce price by £500-£1,500 if your block is sound
Compare rebuilt MG MGC engine prices from UK specialists

What is the most common MG MGC engine failure-

Timing chain tensioner collapse is the #1 catastrophic failure on MG MGC C-series engines, often causing extensive internal damage if not addressed immediately.

  • Original hydraulic tensioner design prone to sudden failure
  • Chain slap damages guides, sprockets and can jump timing
  • Upgraded mechanical or improved hydraulic tensioner essential on rebuild
  • Listen for rattles; stop driving immediately if suspected
Get quotes for MG MGC engine with upgraded tensioner

Can I fit a different engine in my MG MGC-

While engine swaps are possible, most MG MGC owners prioritise authenticity and fit a correct-spec C-series 29G or 29H to preserve value and compatibility.

  • C-series engine mounting points are model-specific
  • Wiring, carburettors and exhaust must match original layout
  • Non-original engines significantly reduce collector value
  • Specialist suppliers like Denis Welch and MGOC Spares offer correct units
Compare authentic MG MGC C-series engine prices

Is a rebuilt MG MGC engine better than a used one-

For a classic MGC, a professionally rebuilt engine with upgraded components offers far better reliability and longevity than an untested used unit.

  • Used engines carry unknown history and hidden wear
  • Rebuilt units include new bearings, seals, gaskets and tensioner upgrade
  • Rebuilt engines come with 12-month warranty; used units typically none
  • Cost difference often justified by peace of mind and reduced risk
Compare rebuilt vs used MG MGC engine options

Do I need a lead-free conversion for my MG MGC engine-

Yes, if you plan to run modern unleaded petrol, a lead-free valve seat conversion is essential to prevent valve seat recession in your MG MGC's C-series engine.

  • Original C-series heads designed for leaded fuel lubrication
  • Unleaded petrol causes accelerated valve seat wear without conversion
  • Most specialist rebuilders include hardened seats as standard
  • Conversion cost typically £200-£500 if not included
Get quotes for MG MGC engine with lead-free conversion

How do I identify my MG MGC engine code-

Your MG MGC engine code (29G, 29H or C-Series) is stamped on the block near the distributor; cross-reference with your VIN for authenticity.

  • Code stamped on left-hand side of cylinder block
  • 29G = high compression UK spec; 29H = low compression export
  • DVLA check via registration confirms original fitment
  • Photograph stamping before ordering replacement
Use our reg check to identify your MG MGC engine code

What specialists rebuild MG MGC engines in the UK-

Trusted UK MG MGC engine specialists include Denis Welch Motorsport, MGOC Spares, and DMG Classic, all experienced with C-series rebuilds and upgrades.

  • Specialists understand MGC-specific mounting and ancillaries
  • Rebuild specs vary; confirm tensioner upgrade and lead-free conversion
  • Compare quotes for identical spec to ensure fair pricing
  • Check warranty terms and core exchange policy before committing
Compare quotes from vetted MG MGC engine specialists

Can I drive my MG MGC if the timing chain is rattling-

No - chain rattle indicates imminent tensioner failure; continuing to drive risks catastrophic engine damage requiring full replacement.

  • Rattle means tensioner has collapsed or chain is loose
  • Further running can bend valves, damage pistons or break crank
  • Arrange recovery to specialist; do not risk driving
  • Budget for tensioner upgrade or full rebuild depending on damage
Get urgent quotes for MG MGC engine repair or replacement

What warranty do rebuilt MG MGC engines come with-

Rebuilt MG MGC engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK specialists.

  • Warranty covers parts and labour for manufacturing defects
  • Confirm scope: some exclude gaskets or ancillaries
  • Keep service records to maintain warranty validity
  • Specialist warranty support essential for classic car peace of mind
Compare MG MGC rebuilt engine warranty terms

How long does an MG MGC engine replacement take-

Supply-only rebuilt engines typically dispatch in 2-6 weeks depending on build queue; supply & fit service adds 3-5 days workshop time.

  • Lead-free conversion or bespoke specs may extend build time
  • Core exchange requires shipping your old engine first
  • Specialist workshops book weeks ahead; plan accordingly
  • Nationwide delivery available; pallet transport required
Check lead times and get quotes for your MG MGC engine

Why Choose Us

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Join thousands of UK drivers who compare MG MGC engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12-month unlimited mileage warranty and nationwide delivery.

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UK Engine Replacement Services for MG MGC

Covering every variant from GT to Roadster, with supply-only or full supply & fit available nationwide.

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