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Original Porsche Part Genuine Porsche part 61610432151

Code: 61610432151

Genuine Porsche part

Original Porsche Part

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

3 3 3

Cylinder head nut. Porsche 911 1965-89 / 356 / 912

90110438204/1

Product Information

Cylinder Head Nut
Sold each - 24 required for the 911

Maintain the integrity and reliability of your Porsche engine rebuild with this OE Match Cylinder Head Nut 90110438204. Designed for use on Porsche 356B, 356C, 912 and classic 911 air-cooled engines, this precision-engineered fastener plays a critical role in securing the cylinder head assembly to the engine.

Fits:

Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 356B 1959-63
Porsche 356C 1963-65

Diagram Ref No 17

Although small in size, cylinder head nuts are among the most important fasteners in any engine. They provide the clamping force required to maintain an effective seal between the cylinder heads, cylinders and engine case, ensuring correct compression, combustion efficiency and long-term engine reliability.

Manufactured to OE Match specifications, this cylinder head nut is ideal for engine rebuilds, top-end overhauls, cylinder head refurbishment and concours restorations.

What Does a Cylinder Head Nut Do?

The cylinder head nut secures the cylinder head assembly to the engine using the cylinder head studs.

Its primary functions include:

Maintaining cylinder head clamping force
Ensuring correct cylinder sealing
Supporting combustion chamber integrity
Maintaining engine compression
Preventing cylinder head movement
Supporting reliable engine operation
Helping prevent oil and combustion leaks

Correct clamping force is essential for maintaining engine performance and durability.

Why Do Cylinder Head Nuts Fail?

Cylinder head nuts are exposed to repeated heat cycles, vibration and engine loads throughout their service life.

Common causes of deterioration include:

Corrosion
Thread wear
Fatigue from repeated heat cycles
Over-tightening
Incorrect installation procedures
Engine overheating
Age-related degradation
Damage during previous rebuilds

In older air-cooled Porsche engines, decades of service can leave original hardware weakened or unsuitable for reuse.

Symptoms of Worn or Damaged Cylinder Head Hardware

Potential warning signs include:

Loss of cylinder sealing
Compression leaks
Oil seepage around cylinder heads
Difficulty achieving correct torque settings
Damaged threads
Corroded hardware
Uneven clamping loads
Engine rebuild inspection failures

Many of these issues are discovered during engine disassembly rather than during normal operation.

When Should Cylinder Head Nuts Be Replaced?

Replacement is strongly recommended when:

Rebuilding an engine
Carrying out a top-end overhaul
Replacing cylinder head studs
Refurbishing cylinder heads
Corrosion is present
Threads show signs of wear
Factory specifications require replacement

Most professional Porsche engine builders replace critical fastening hardware during major engine work to ensure long-term reliability.

Why Replacement Matters

Reusing worn or damaged cylinder head hardware can compromise engine sealing and reliability.

Benefits of replacement include:

Correct clamping force
Improved sealing performance
Reduced risk of leaks
Improved engine reliability
Professional rebuild standards
Long-term durability
Factory-correct restoration quality
Greater peace of mind

For classic Porsche engines, replacing critical hardware is inexpensive insurance against future engine issues.

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

90110438204

90110438203

90110438202

61610438200

90110438200

93010438201

90110438204

The product you are viewing cross references to these numbers

4 4 4 4

Exhaust valve guide. Porsche 912 1.6 / 356

61610432260/1

Product Information

Exhaust Valve Guide Outlet.
Maintain accurate valve operation and long-term engine reliability with this OE Match Exhaust Valve Guide (Outlet), manufactured as a direct replacement. Produced to OE-style specifications, this valve guide supports and aligns the exhaust valve as it moves within the cylinder head, ensuring smooth operation, correct seating, and effective heat transfer from the valve to the cylinder head.
Sold Each.

Fits:

Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 356 1950-55
Porsche 356A 1955-59

Diagram Ref No 5

Operating under extreme temperatures and continuous movement, exhaust valve guides gradually wear over time. Excessive clearance between the valve stem and guide can result in poor valve alignment, increased oil consumption, loss of compression, and accelerated valve train wear. Replacing worn valve guides restores correct valve support and helps maintain efficient engine performance. This OE Match component is ideal for routine maintenance, engine repairs, cylinder head refurbishment, engine rebuilds, and Porsche restoration projects.

What This Product Does:

Supports and accurately guides the exhaust valve within the cylinder head.
Maintains correct valve alignment throughout operation.
Promotes proper valve seating for effective cylinder sealing.
Assists with heat transfer from the exhaust valve to the cylinder head.
Reduces wear on the valve stem and valve seat.
Restores original valve train geometry during engine rebuilds.
Provides an OE-style fit and dependable quality.

Symptoms Of Wear Or Failure:

Excessive engine oil consumption.
Blue exhaust smoke caused by oil entering the combustion chamber.
Reduced engine compression.
Excessive valve stem movement.
Accelerated valve stem or valve seat wear.
Rough engine running or reduced performance.
Excessive valve train noise.
Worn or oversized valve guide bore.

Why Replacement Matters:

The exhaust valve guide plays a vital role in maintaining correct valve alignment, supporting smooth valve movement, and transferring heat away from the exhaust valve. A worn valve guide can allow excessive valve movement, resulting in poor sealing, increased oil consumption, reduced compression, and premature wear of other valve train components.
Replacing the exhaust valve guide restores accurate valve operation, improves combustion efficiency, and helps extend the service life of the engine during rebuilds or cylinder head refurbishment. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match exhaust valve guide provides the correct fit, dependable quality, and long-lasting durability, making it an excellent choice for Porsche maintenance, repairs, engine rebuilds, and restoration projects.

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

61610432260

61610432260

The product you are viewing cross references to these numbers

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Original Porsche Part Genuine Porsche part 61610432151