Motek EuroWerkz Engine Development Program
McLaren
M838T / M840T
P14 · 720S · 765LT · Senna · GT · Speedtail · 650S · 600LT · 570S
We build fully reconditioned McLaren longblocks for customers who need real power and need it to hold. Our shop has been producing race engines and high-output road engines for over 27 years. Every engine we send out runs proprietary internal components machined to our own specs, including purpose-made pistons, connecting rods, and a billet crankshaft built to take loads the factory never accounted for.
0
Max HP (Stage 3)
4.0L
Displacement
0
Years Race Engine Dev
Configure Your Build
Starting From
$41K
Stage 1 · Core required · Contact for exact quote
Select Stage
Request a Quote
Call 469-298-2880
We only build sealed longblocks. No short blocks. Your core needs to come to us before we start work. We can help coordinate shipping if needed â we have been moving engines worldwide for over 27 years. Reach out before you ship and we will get you set up.
Engine Overview
McLaren M838T & M840T Platform
The M840T is a 4.0-liter twin-turbocharged flat-plane V8. McLaren introduced it in 2017 across the 720S, Senna, GT, and Speedtail as a significant step up from the 3.8-liter M838T used in earlier cars like the 650S and 675LT. That earlier motor itself had roots in a Le Mans Nissan engine architecture with Mitsubishi EVO-sourced turbos carrying over into the design.
The 720S found its crowd quickly. On drag strips it went door to door with Nissan GT-Rs and Audi R8s while holding its own identity through a recognizable exhaust note. EKanoo Racing was among the first shops pushing the platform hard, running 8.85 seconds at 159 mph with performance downpipes, air filters, a tune, and MS109 fuel.
As more owners started modifying their cars, the failures started showing up too. Teardowns on high-output builds pointed to the same things: excessive oil consumption, early wear, and bent connecting rods. The OEM internals were not built for that kind of load, and McLaren was not offering replacement parts at the time. That gap is what led us to develop this program.
Our Approach
The Motek EuroWerkz Engine Program
Motek EuroWerkz has been building race engines and high-performance road engines for over 27 years. When the McLaren twin-turbo platform started showing up in shops with recurring internal failures, we put that experience to work developing parts that actually solve the problem. That means proprietary pistons, connecting rods, and crankshafts machined to our specs, along with improved cylinder liners, head gaskets, precision fasteners, and every other component needed to keep a high-output build together long term.
Every engine that leaves our shop is a complete sealed longblock. No short blocks. You send us your core, we tear it down, recondition everything, and rebuild it to the spec you choose. You get the engine back fully assembled with timing components installed and valve covers and engine covers in place. We also do M838T 3.8L to M840T 4.0L conversions for customers who want to take that step.
Platform Coverage
Supported Engine Variants
Engine Code
Compatible Models
Displacement / Type
M838T
MP4-12C · MP4-12C GT3 · 650S · 675LT · MSO 688 HS
3.8L Twin-Turbo V8
M838TQ
P1 · P1 GTR · P1 LM
3.8L Hybrid Performance
M838TE
540C · 570S · 600LT · 620R
3.8L Sport Series
M840T
720S · 720S GT3 · 720S GT3X · 765LT · Speedtail
4.0L Twin-Turbo V8
M840TR
Senna · Senna GTR · Elva
4.0L Race Specification
M840TE
GT
4.0L Grand Tourer Tune
Build Packages
Stage Options
Stage 1
Up to 1,200 HP Capable
A complete engine refresh using our proprietary pistons and connecting rods. Stage 1 is the right call for most high-output street and circuit builds where you need a solid, reliable foundation without going into full race territory. Part No: MMEENG7250
Stage 2
Up to 1,500 HP Capable
A full rebuild that goes further than Stage 1. You get our proprietary pistons, crankshaft-guided connecting rods, a billet crankshaft, upgraded fasteners, and a complete engine gasket set. Stage 2 is built for serious drag and track cars where the power numbers leave no room for stock hardware. Part No: MMEENG7251
Stage 3
Up to 2,000 HP · Fully Customizable
Stage 3 is our top-end program and it is built around your specific goals. Power level, fuel type, turbo setup, intended use case â we put together the spec around what you are actually trying to do. Pricing starts at $80K and scales depending on what goes into the build. Reach out and we will walk through the options with you.
Components & Part Numbers
Available Parts
| Part Number | Description |
|---|---|
| MMEENG7250 | M838T / M840T Stage 1 Longblock Rebuild, 1,200 HP (Core Required) |
| MMEENG7251 | M838T / M840T Stage 2 Longblock Rebuild, 1,500 HP (Core Required) |
| MMCENG1200 | M840T 720S / 765LT Connecting Rods |
| MMCENG1210 | M840T 720S / 765LT Pistons |
| MMCENG7200 | M840T P14 720S / 765LT Engine Block |
| MMCENG7201 | M840T P14 Billet Crankshaft |
| MMCENG7203 | McLaren Thrust Bearings |
| MMCENG7204 | McLaren Bolts and Washers |
| MMCENG7205 | McLaren Friction Washer |
| MMCENG7206 | M840T 4.0L Piston Sleeves |
| SYVECS S7+ | Plug and Play ECU, M838T and 720S Compatible |
From Our Shop Floor