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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://design91.uk/images/schemaLogo.png https://design91.uk/images/schemaLogo.png +443456003478 https://design91.uk Facebook Instagram

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99710311501/4
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Product Information
Porsche 986/987/996/997 M9 Rod Bolt Kit.
A must when rebuilding any 1997-2008 M96 or M97 engine to prevent costly rod bolt failures.
SET OF 12

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Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster MKI 2005-08
Porsche 987C Cayman MKI 2005-08
Porsche 996 Carrera 1998-05
Porsche 997 Carrera 2005-08

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Diagram ref no 11.

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Related, superseded, cross reference or alternative numbers for comparison.

99710311501
99610311551
99710311501

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99610418059/4
Product Information
Product Information
Cylinder head bolt. M10 x 230.
SET OF 24 head studs, washers & nuts.

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Fits:
Porsche 986 Boxster 2.7L / S 3.4L 2003-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08
Porsche 996 C2 / C4 / C4S 2002-05
Porsche 997 Carrera 2005-08

Click 'Zoom in' for large parts diagram
Diagram ref no 20.

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Related, superseded, cross reference or alternative numbers for comparison.

99610418059
204-4707
99610418056
99610418057
99610418058
99610418059
99610418054

The product you are viewing cross references to these numbers
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About Engine Rods and Bolts

Porsche Connecting Rods & Performance Bolts - High-Strength Engine Internals

Connecting Rods and Performance Bolts are critical engine internals responsible for transferring combustion forces from the pistons to the crankshaft while maintaining precise engine geometry under extreme load. In high-performance, tuned, or high-mileage Porsche engines, upgraded rods and bolts provide the strength and reliability required to safely handle increased power and RPM.

Available from Design911, this category includes high-strength Porsche connecting rods and performance-grade rod bolts engineered for demanding engine builds, rebuilds, and motorsport applications.

What Do Rods & Bolts Do?

Rods and bolts form the structural link between the piston and crankshaft, enduring immense forces every engine cycle.

Core Functions:

  • Transfer combustion energy to the crankshaft.
  • Maintain correct piston motion and alignment.
  • Withstand tensile and compressive forces at high RPM.
  • Secure the rotating assembly under extreme load.
  • Support reliable operation in performance engines.

High-quality rods and bolts are essential for engine durability and safety.

Why Do Rods & Bolts Fail?

Standard factory rods and fasteners are designed for original power levels and daily driving. Failures can occur due to:

  • Increased cylinder pressure from tuning or forced induction.
  • High RPM stretching standard rod bolts.
  • Metal fatigue from heat cycling and age.
  • Detonation causing shock loads through the rotating assembly.
  • Reuse of torque-to-yield bolts during rebuilds.

Rod or bolt failure often results in catastrophic engine damage, including broken blocks or crankshaft failure.

Why Upgrade Rods & Bolts?

Upgraded rods and performance bolts are designed to exceed the limits of factory components.

Upgrade Benefits:

  • Stronger forged steel or billet rod construction.
  • High-tensile performance bolts for improved clamping force.
  • Increased safety margin for high-output engines.
  • Improved reliability for track, race, and tuned applications.
  • Essential upgrade during engine rebuilds.

Upgrading rods and bolts protects the bottom end and enables safe power increases.

Highlights

  • High-strength Porsche connecting rods and performance bolts
  • Designed for tuned and motorsport engines
  • Improved resistance to stretching and fatigue
  • Ideal for engine rebuilds and power upgrades
  • Proven reliability in high-load applications       

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