Camshafts

OE Match replacement camshaft for Porsche 993 applications, with specific C2 / C4 fitment listed for 1994–95. Separate part references identify the left and right applications.

Fits

Porsche 993 C2 / C4 1994-95
with engine: 6405, 6406, 6407, 6408

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram ref no 23 

What This Product Does

The camshaft operates the valve train through its shaped lobes, determining valve opening, lift and closing events. Its profile and condition influence how the engine admits its intake charge and releases exhaust gases.

Functions

• Actuates the associated valve-train components.
• Defines valve lift and opening duration.
• Controls valve events within the engine cycle.
  
  

Technical Details

• Brand: OE Match.
• Left camshaft reference: 99310524716.
• Right camshaft reference: 99310524613.
• Diagram engine designations: M64.05/06 and M64.07/08.
• Both supplied valve-control diagrams cover the 993 assembly for 1994–98; this assembly coverage does not replace the specific fitment checks above.
  
  

Symptoms of Fault

• Tapping or ticking around the valve train.
• Uneven idle, misfiring or reduced engine output.
• Scored, pitted or visibly worn cam lobes.
• Unusual contact wear on rockers or followers.
• Metallic particles discovered during oil or filter inspection.
  
  

These signs are not exclusive to camshaft damage. Confirm the cause through inspection before selecting replacement components.

Why Replacement Matters

Renewal is appropriate when inspection establishes damaged lobes or wear affecting valve operation. During rebuild work, assess the contacting rockers or followers and investigate lubrication problems or contamination. Leaving the underlying cause unresolved can expose replacement components to further wear.

FAQs

Should the rockers or followers be checked?
Yes. Inspect their contact surfaces and replace worn components as required rather than assuming they remain suitable.

Can lubrication problems damage a camshaft?
Insufficient lubrication or abrasive contamination can contribute to surface deterioration. Investigate the oil supply and any debris before reassembly.

How do I select the correct version?
Match the engine designation, production details and required side to the relevant part reference. The left and right references identify different applications.

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Related, superseded, cross reference or alternative numbers for comparison.

99310524

The product you are viewing cross references to these numbers

OE Match camshaft for selected Porsche 993 C2, C4, C2S and C4S applications. The supplied references identify separate left- and right-hand versions, so confirm the required position and engine specification.

Fits

Porsche 993 C2 / C4 1996-98
with engine: 6421, 6422, 6423, 6424

The vehicle listings above must be checked alongside the engine-specific application and required camshaft reference.

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram reference no 23

What This Product Does

The camshaft operates the valve train, determining when valves open and close and how far they move. Its lobe profile controls valve movement in relation to engine rotation. Correct selection is therefore important during cylinder-head repairs or an engine rebuild.

Functions

• Controls valve opening and closing events.
• Determines valve lift and opening duration.
• Coordinates valve operation with the engine cycle.
  
  

Technical Details

• Brand: OE Match.
• Left-hand camshaft reference: 99310524715; shown in valve control diagram 103-10, item 33.
• Right-hand camshaft reference: 99310524614; shown in valve control diagram 103-15, item 24.
• Diagram engine designations: M64.21/22 and M64.23/24.
• Supplied engine identifiers: 6421, 6422, 6423, 6424.
• Left and right valve-control diagrams cover Porsche 993 applications from 1994–98.
  
  

Symptoms of Fault

• Tapping or ticking around the valve train.
• Irregular idle, misfiring or uneven engine operation.
• Reduced engine output associated with valve-actuation problems.
• Pitted, scored or visibly worn cam lobes.
• Unusual wear on the contacting rocker or follower surfaces.
• Metal particles discovered during oil or filter inspection.
  
  

These signs are not conclusive evidence of camshaft failure. Inspect the valve train and lubrication system before selecting replacement components.

Why Replacement Matters

A damaged lobe can prevent the intended valve movement. Replacement may be appropriate where inspection confirms wear, pitting or scoring. Establish whether inadequate lubrication or contaminated oil contributed to the damage, and assess contacting components before reassembly. During a rebuild, inspect associated seals, timing components and fixings rather than assuming they remain serviceable.

FAQs

Which reference identifies each side?
The supplied diagrams associate 99310524715 with the left-hand assembly and 99310524614 with the right-hand assembly.

Should the rockers or followers be inspected?
Yes. Worn contact surfaces can affect a replacement camshaft; assess them during dismantling.

Can lubrication problems damage a camshaft?
Insufficient oil supply or abrasive contamination can contribute to surface deterioration. Investigate the cause alongside the visible damage.

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

99310524

The product you are viewing cross references to these numbers

Camshaft.

Fits:
Porsche 993 C2 / C4 1994-95
with engine: 6405, 6406, 6407, 6408

Click 'Zoom in' for large parts diagram.
Diagram ref no 23

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

99310524

The product you are viewing cross references to these numbers

Camshaft.

Fits:
Porsche 993 C2 / C4 1996-98
with engine: 6421, 6422, 6423, 6424

Click 'Zoom in' for large parts diagram.
Diagram ref no 23

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

99310524

The product you are viewing cross references to these numbers

O-ring - 67.2 x 5.77 - for front camshaft flange. 

Sold individually; fits left or right camshaft. 

Fits:
Porsche 964 Carrera / RS 1989-94
Porsche 964 Turbo 3.6L 1993-94*

Porsche 993 Carrera / RS 1994-98
Porsche 993 Turbo / GT2 1995-98

Diagram ref. 1.

*NOTE: This o-ring is intended for later 3.6L 964 Turbo models and is not compatible with the earlier 3.3L engine.

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

99970731340

The product you are viewing cross references to these numbers

O-ring - 8.3 x 2.4 - for the camshaft pressure pipe. 

Sold individually; x4 required per vehicle. 

Fits:
Porsche 993 Carrera 1994-98 
Porsche 993 Carrera RS 1995-96
Porsche 993 Turbo 1995-98 
Porsche 993 GT2 1995-98

Diagram ref. 13. 

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

99970144940

The product you are viewing cross references to these numbers

Sport Camshaft Set

Fits:
Porsche 964 Carrera 2 / Carrera 4 - 1989 to 1994
Porsche 993 Carrera 2 / Carrera 4 - 1994 to 1997
Porsche 993 Carrera S / Carrera 4S - 1994 - 1997

This is specifically designed for the 964 and 993 engines running mechanical rocker arms (MRA). It is ideal for those after performance throughout the entire rev range on the road or for light track use. 

This is a mild-mannered road camshaft that won't be too lumpy at idle. 

We source this camshaft from Schrick AVL in Germany to ensure quality, performance, reliability and precise fitment.

Camshaft Specs:

Intake Cams:
Cam Lift (mm)= 8.8mm
Valve Lift (mm) = 13.2 mm
Opening Duration °CRA = 288°
Peak Timing °CRA = 114°
Valve Timing °CRA (IO-IC) = 30-78
Valve Lift at TDC (mm) = 2.1mm
Valve Clearance (mm) – 0.2mm
Bearing - Ø 49 mm with drive for power steering pump

Exhaust Cams:
Cam Lift (mm)= 8.8mm
Valve Lift (mm) = 13.2 mm
Opening Duration °CRA = 280°
Peak Timing °CRA = 114°
Valve Timing °CRA (EO-EC) = 74-26
Valve Lift at TDC (mm) = 1.7mm
Valve Clearance (mm) – 0.2mm
Bearing - Ø 49 mm with drive for power steering pump

Please note: 
These camshafts are for naturally aspirated 964 and 993 models with mechanical rocker arms (MRA). Different manufacturing tolerances require an inspection of the free clearance of all parts

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

1880020005

The product you are viewing cross references to these numbers