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Porsche > 996 (911) (1997-2005) > 996 GT2 2001-05 > Engine Rebuild Parts >

Camshafts

Camshafts

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Camshaft Alignment Tool / Engine Timing Kit for Porsche 996 Turbo & GT2 / 997.1 Turbo & GT2 / 997.2 GT2 RS - Reduced to Clear (Minor Cosmetic Marks) - 9661, 9661/1, 9401 - C4017
2
Camshaft Alignment Tool / Engine Timing Kit for Porsche 996 Turbo & GT2 / 997.1 Turbo & GT2 / 997.2 GT2 RS - Reduced to Clear (Minor Cosmetic Marks)
C4017U
Product Information
Product Information

Camshaft Alignment Tool for Porsche – Precision 4-Cam Timing Locking System

This camshaft alignment tool is designed specifically for the four-cam 3.6-litre engines used in the Porsche 996 Turbo, 996 GT2, 997.1 Turbo, 997.1 GT2, and 997.2 GT2 RS. Engineered for absolute accuracy, it ensures all four camshafts remain precisely locked in their timed positions during timing chain replacement, camshaft servicing, cylinder-head work, or complete engine rebuilds. 

Reduced to Clear: This item is offered at a reduced price due to cosmetic marks from storage and handling. Please review the photographs carefully, as they form part of the item description. 

Fits:
Porsche 996 Turbo 3.6L 2001-05 - M96/70 & M96/70E
Porsche 996 GT2 3.6L 2001-05 - M96/70S 

Porsche 997.1 Turbo 3.6L 2007-09 - M97/70 
Porsche 997.1 GT2 3.6L 2008-09 - M97/70S

Porsche 997.2 GT2 RS 3.6L 2011 - M97/70

NOTE: This tool is not compatible with the Porsche 997.2 Turbo. Although it uses a 3.6-litre engine, it is based on the DFI 9A1 engine family rather than the Mezger-derived M97 engine and therefore requires different timing tools. 

Optimised for Porsche’s high-performance Turbo and GT2 engines—where timing precision is critical—this tool set allows for clean, safe, and repeatable alignment, mirroring the function of specialist tools listed under 9661, 9661/1, and 9401.

Whether used in a professional Porsche workshop or by an advanced engine builder, this tool is essential for maintaining the performance, reliability and timing integrity of these legendary Mezger-based engines.

What This Camshaft Alignment Tool Does

This tool set enables:

  • Precise positioning of all four camshafts on 3.6-litre Porsche turbo and GT2 engines
  • Secure locking of cams during chain replacement and timing setup
  • Accurate timing retention, preventing rotation or timing mismatch
  • Correct alignment during cam phaser and chain tensioner servicing
  • Professional-grade engine rebuilds with consistent timing accuracy
  • Simplified installation via two specialised wrenches and pre-tensioner tools

Accurate camshaft timing ensures optimal engine performance, combustion efficiency, and long-term reliability.

Tool Set Components

  • Two long camshaft wrenches (two thicknesses) for easy access and leverage
  • Two cam chain pre-tensioner tools, ensuring chain tension during timing setup
  • Locking fixtures for all four camshafts to maintain exact alignment

Designed for safe, efficient and repeatable timing chain replacement.

Compatible with engine types
M97/70S M97/70 M96/70S M96/70E

Why Timing Components Fail on Mezger-Based Porsche Engines

These high-performance engines are subjected to extreme loads, track usage, and high temperatures. Common failure points include:

  • Timing chain stretch affecting cam synchronisation
  • Worn cam chain guides causing slack and deviation
  • Tensioner wear leading to startup rattles or timing drift
  • Improper timing after previous repairs when incorrect tools were used
  • Heat cycling, causing expansion and contraction of timing components
  • Cam phaser wear, impacting valve timing accuracy

Symptoms often include: misfires, timing-related fault codes, loss of boost response, uneven idle, or unusual mechanical noise.

Why You Should Replace or Use This Camshaft Alignment Tool

A precision camshaft alignment tool ensures:

  • Perfect synchronisation of all four camshafts Safely maintained timing during chain replacement
  •  Protection from costly piston-to-valve interference
  • Accurate VVT/cam phaser alignment
  • Reduced risk of engine damage during rebuilds
  • Professional-standard timing result
  • Confidence when working on high-value Porsche Turbo and GT2 engines

This tool is essential for anyone servicing or rebuilding Mezger-engined 911 models.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

C4017U
9661
9661
9401

The product you are viewing cross references to these numbers
Sport Camshafts (4pc Set) Porsche 996TT/ 996 GT2 - 1001059960000tt
1
Sport Camshafts (4pc Set) Porsche 996TT/ 996 GT2
996100105292
Product Information
Product Information
Sport Camshafts (4pc Set). Porsche 996TT/ 996 GT2

koblenz

Camshafts for hydraulic "variocam plus" lifters.
Works with oem lifters!
Increase up to 40HP
Intake: 276°/95--125°/ 11mm / 0,45-3,0mm
Exhaust: 274°/115°/ 10,6mm / 0,97mm

Fits:
Porsche 996 Turbo
Porsche 996 GT2

This set should only be fitted by engine builders or tuners as other performance parts may be required

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

996100105292
1001059960000tt

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Camshafts

Precision-Engineered Camshafts – Performance, Reliability, and Power for Porsche Engines

Camshafts are the heartbeat of any Porsche engine, controlling the timing and lift of the intake and exhaust valves to ensure precise combustion and efficient power delivery. A well-tuned camshaft defines how your engine breathes, responds, and performs — whether it’s a daily-driven 911 or a track-focused GT model.

At Design911, we supply a complete range of high-quality and performance-grade camshafts engineered to meet or exceed manufacturer specifications. Each camshaft is precision-machined for exact tolerances, ensuring smooth valve operation, consistent timing, and optimal performance across all driving conditions.

What Do Camshafts Do?

Camshafts regulate how air and fuel enter and exit the combustion chamber. By controlling valve timing, lift, and duration, they play a crucial role in engine power and efficiency.

Core Functions:

  • Control valve timing for optimal engine breathing.
  • Determine power characteristics, from low-end torque to high-rpm performance.
  • Synchronise intake and exhaust cycles for smoother operation.
  • Enhance efficiency, combustion stability, and throttle response.

High-performance camshafts are often tuned to deliver sharper throttle response, higher power output, and improved torque delivery for modified or rebuilt engines.

Why Do Camshafts Fail?

Even with Porsche’s engineering excellence, camshafts are subject to wear over time. Common causes of camshaft failure include:

  • Oil starvation leading to friction and surface wear.
  • Excessive heat or poor lubrication degrading cam lobes.
  • Improper timing belt/chain tension causing misalignment or damage.
  • Mechanical fatigue due to extended mileage or racing conditions.
  • Contaminated oil introducing abrasive particles into the valvetrain.

A worn or damaged camshaft can cause loss of power, misfires, rough idle, and reduced engine efficiency — making timely replacement essential to restore peak performance.

Why Replace with Performance-Grade Camshafts?

Replacing worn components with precision-engineered camshafts restores engine reliability and maximises output. Upgraded camshafts can also provide noticeable gains in horsepower and responsiveness.

Key Benefits:

  • Restores valve timing accuracy and smooth engine operation.
  • Increases power and torque, especially in performance-tuned engines.
  • Improves fuel combustion efficiency for cleaner running.
  • Ensures long-term reliability with precision-machined surfaces and premium materials.
  • Perfect fitment with no modification required on compatible Porsche engines.

Whether maintaining a classic flat-six or upgrading a modern turbocharged engine, these camshafts are designed to deliver manufacturer-level precision with motorsport-grade durability.

Highlights:

  • Precision-engineered camshafts for Porsche models old and new.
  • Enhanced performance and reliability, meeting manufacturer standards.
  • Motorsport-grade construction ensures durability under extreme loads.
  • Improved airflow and combustion efficiency for optimal power delivery.
  • Ideal for restorations, rebuilds, and performance tuning projects.
  • Designed for seamless compatibility with Porsche flat-six, turbo, and hybrid engines.       

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