Specialist Tools

Cam profile plates for Porsche 996 / 997 GT3



Use our GT3 Cam Profile Plates to rough-in your GT3 cams prior to timing.
CNC machined from high quality aluminum and hard-coat anodized for protection and good looks, these plates will speed up setup time and ensure your cams are properly positioned before you start timing the engine.
With four cams and 24 valves to coordinate, these plates are sure to add that bit of confidence before you turn the engine over for the first time.

Sold as a set of two plates.

Cam sprocket tool for Porsche 996 / 997 GT3



STOMSKI RACING's version of this tool works on both the intake and the exhaust cams on the Cup engines and on all non-vario cams for the other GT3-type engines. This tool replaces the factory tool P9653/1. Moreover, additional refinements of this tool ensures that while torquing either the 16mm hex or the triple-box cam sprocket bolts, your tool is securely bushed and supported in the center of the tool, and thus will not slip off or round off the bolts. Black oxide finished hardened steel.

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.

Fits:

• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 GT3 2007-09
• Porsche 997 Mk1 Turbo 2010-13
• Porsche 997 MK1 GT2 2007-09
• Porsche 997 MKII GT2 RS 2011-13

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.

C4017

The product you are viewing cross references to these numbers

Camshaft Locking Set – Precision Tools for Accurate Camshaft Alignment

Accurate camshaft alignment is critical when servicing, rebuilding or timing the flat-six engines found in Porsche 986 / 987.1 Boxster & Cayman and 996 / 997.1 911 models. This engine timing set provides the precision tools required to correctly position camshafts and crankshafts, ensuring perfect timing during reassembly, chain tensioner replacement, cylinder head work, or any major engine repair.

Designed to maintain exact engine timing specifications, this tool kit eliminates guesswork and prevents costly misalignment that can lead to poor running, misfires or engine damage.

Built for workshop professionals and skilled enthusiasts, this is an essential toolset for anyone performing timing work on M96 and M97 Porsche engines.

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04
• Porsche Boxster 987 2.7L 2005 -08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-2012
• Porsche Boxster S 987 MKII 3.4L 2009-2012
• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C2 3.6L 09/01-2005
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08
• Porsche 997 MKII Carrera C2 3.6L 2009-12
• Porsche 997 MKII Carrera C4 3.6L 2009-12
• Porsche 997 MKII Carrera C2S 3.8L 2009-12
• Porsche 997 MKII Carrera C4S 3.8L 2009-12
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08
• Porsche Cayman 2.9L 987C MKII 2009-12
• Porsche Cayman S / R 3.4L 987C MKII 2009-12

Kit Contains 
1 x TDC Alignment Pin – Locks crankshaft at TDC.
1 x Camshaft Lock  – To establish the allocation between the intake and exhaust camshafts.
2 x Camshaft Supports – for retaining the camshafts in position with the valve cover removed.
2 x Camshaft Holding Tools  – Used to retain the camshafts before removing the valve cover and during reassembly. 
1 x Connecting Rod Centering Mandrel – Positions the small of the connecting rod in preparation for fitting the piston and wrist pin.
1 x Piston Pin Driver and Extensions – Used to insert the wrist pins.

What an Engine Timing Set Does

This specialist set enables accurate and safe engine timing by:

• Locking camshafts in the correct position during timing procedures
  
• Aligning crankshaft and camshaft timing marks with precision
  
• Ensuring correct valve timing, preventing piston-to-valve contact
  
• Assisting with chain tensioner installation and re-tensioning
  
• Supporting engine rebuild tasks, including head removal or IMS service
  
• Maintaining timing accuracy during belt, chain or component replacement

With precise camshaft positioning, the engine runs smoother, delivers optimal performance and maintains proper combustion cycles.

Why Engine Timing Components Fail or Require Adjustment

Porsche M96 and M97 engines rely on accurate timing to ensure performance and engine longevity. Over time, several factors can cause timing issues:

• Chain stretch or wear from high mileage
  
• Worn chain guides causing slack or timing deviation
  
• Failing tensioners, common in ageing engines
  
• Camshaft deviation errors triggered by worn components
  
• Incorrect timing after previous repairs when tools were not used
  
• IMS-related service procedures, requiring camshaft locking
  
• General rebuild work, where camshafts and chains are removed

Symptoms include rough idle, loss of power, misfires, check engine lights or tapping noises.

Why You Should Replace or Use a Proper Camshaft Alignment Tool Set

Using a precision-engineered timing set designed to exceed original accuracy standards ensures safe, correct and efficient engine service.

Benefits include:

• Prevents engine damage from incorrect timing
• Ensures precise valve timing and performance
• Reduces risk of piston-to-valve interference
• Speeds up major engine work with accurate alignment
• Essential for rebuilds, timing chain replacement or head gasket work
• Ideal for diagnosing cam deviation or timing-related engine faults
• Ensures repeatable, professional-quality results

For any major repair on a Boxster, Cayman, 996 or 997 engine, a proper timing set is essential.