Please wait… 
Please wait while we process your order,
do not press the back button…
do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
Price Match Guarantee
Worldwide Delivery
12 Month Warranty
Engine Bolts / Studs
By OE Match
Refine by Car Type
- 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)
Filter by brand
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Information
Engine case studs.
24 per engine. Price is for each.
Fits:
Porsche 911 1965-73
(Not 1973 2.7L Carrera)
Porsche 914-6 1970-72
Diagram ref No 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110117203
The product you are viewing cross references to these numbers
24 per engine. Price is for each.
Fits:
Porsche 911 1965-73
(Not 1973 2.7L Carrera)
Porsche 914-6 1970-72
Diagram ref No 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110117203
90110117203
The product you are viewing cross references to these numbers
Price: €7.80
In stock
Vehicle Group
- 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)
Information
Upper Head / Barrel Stud – Sold Each
12 required except 2.7 Carrera RS where 24 are required (upper and lower)
The Porsche Upper Head / Barrel Stud is a critical engine
fastening component used in Porsche 911 models produced from 1973 to 1989. This
stud forms part of the cylinder head retention system that secures the engine
cylinders (barrels) and cylinder heads firmly to the crankcase, maintaining the
precise clamping force required for reliable engine operation.
Fits:
- Porsche 911 1973 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)
Diagram Ref No 2
Porsche's air-cooled flat-six engines rely on these studs to withstand enormous combustion pressures and continuous thermal expansion cycles. Without adequate clamping force, cylinder sealing can be compromised, leading to compression loss, oil leaks, exhaust gas leakage, and costly engine damage.
For most Porsche 911 models within this period, 12 upper head studs are required. The notable exception is the legendary Porsche 2.7 Carrera RS, which requires a complete set of 24 studs.
Whether you're carrying out a top-end rebuild, complete engine overhaul, or concours restoration, replacing ageing head studs is an important step in maintaining long-term engine reliability.
What Does the Upper Head / Barrel Stud Do?
The upper head stud provides the clamping force that secures the cylinder head and cylinder barrel assembly to the engine crankcase.
Its primary functions include:
- Securing the cylinder heads to the engine case
- Maintaining correct cylinder sealing pressure
- Preserving combustion chamber integrity
- Preventing movement between cylinders and heads
- Supporting stable engine compression
- Maintaining long-term engine reliability
The stud is constantly under tension and plays a crucial role in preserving the structural integrity of the entire engine assembly.
Why Does the Head Stud Fail?
Head studs operate under extreme conditions, being subjected to continuous heat cycles, combustion forces, vibration, and material expansion and contraction.
Common causes of failure include:
- Metal fatigue
- Corrosion and oxidation
- Age-related material degradation
- Thermal cycling stress
- Engine overheating
- Improper torque procedures during previous rebuilds
- High-mileage wear Long-term mechanical loading
Even on well-maintained engines, decades of operation can weaken original studs and reduce their ability to maintain the required clamping force.
Common Symptoms of a Failing Head Stud
A damaged or broken head stud can result in:
- Compression leaks
- Exhaust gas leakage between the cylinder and head
- Ticking noises from the cylinder heads
- Oil seepage around the cylinder base
- Reduced engine performance
- Uneven cylinder sealing
- Failed leak-down test results
- Visible broken studs during valve cover inspection
In some cases, a broken head stud may go unnoticed until routine valve adjustment or engine rebuild work is carried out.
When Should You Replace Head Studs?
Head studs should always be inspected during major engine work and replaced whenever wear, corrosion, or damage is identified.
Replacement is highly recommended:
- During top-end rebuilds
- During complete engine overhauls
- When one or more studs have broken
- During cylinder head refurbishment
- On high-mileage engines
- During preventative restoration projects
- When upgrading engine performance
- Whenever the cylinder heads are removed
Because replacing head studs requires significant engine disassembly, many Porsche specialists recommend replacement while access is available.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110117200
91110117200
The product you are viewing cross references to these numbers
Price: €8.88
In stock
Vehicle Group
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Information
Exhaust head stud, BM 8 X 22 SN 1115
Sold each.
Fits
Porsche 911E
Porsche 911S
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90006010601
The product you are viewing cross references to these numbers
Sold each.
Fits
Porsche 911E
Porsche 911S
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90006010601
90006100701
90006100702
99906200702
90006010601
The product you are viewing cross references to these numbers
Price: €4.78
In stock
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Information
Exhaust head stud, L - 36mm
Sold each.
Fits
Porsche 911 2.7L / 3.0L 1974-83
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906200603
The product you are viewing cross references to these numbers
Sold each.
Fits
Porsche 911 2.7L / 3.0L 1974-83
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906200603
99906200602
99906200603
The product you are viewing cross references to these numbers
Price: €1.50
In stock
Vehicle Group
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Information
Exhaust head stud
Sold each.
Fits
Porsche 911T >>1973
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906200804
The product you are viewing cross references to these numbers
Sold each.
Fits
Porsche 911T >>1973
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906200804
90006100801
90006100802
99906200802
99906200804
The product you are viewing cross references to these numbers
Price: €1.80
In stock
Vehicle Group
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
Cylinder head nut washer (Head nut washer)
This washer is used under the cylinder head nuts on Porsche 911 engines (1978–1989). It’s a precision washer made to the same style and dimensions as the original, helping the head nut seat correctly against the engine hardware.
Price is for each, 24 required per engine.
Fits:
Porsche 911 1978 - 1989
Diagram ref no 16
The washer spreads the clamping load from the head nut, helping maintain consistent torque retention and protecting mating surfaces from damage caused by concentrated pressure.
• It’s supplied per washer (price is for each) and 24 washers are required per engine.
It provides a stable, even load surface beneath each head nut, supporting correct tightening and helping the cylinder head fastening system maintain consistent clamp force over time - especially important on engines that see repeated thermal expansion and contraction.
• Distributes head nut load to reduce point-stress on components
• Helps maintain more consistent clamping force as the engine heat-cycles
• Supports proper seating of the head nut for reliable assembly during rebuilds
Old washers can become corroded, deformed, or marked from previous torque cycles. Reusing tired hardware can affect how evenly the head nuts clamp, which can compromise long-term sealing and reliability. Fresh washers help restore proper seating and load distribution during rebuild work.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903109101
The product you are viewing cross references to these numbers
This washer is used under the cylinder head nuts on Porsche 911 engines (1978–1989). It’s a precision washer made to the same style and dimensions as the original, helping the head nut seat correctly against the engine hardware.
Price is for each, 24 required per engine.
Fits:
Porsche 911 1978 - 1989
Diagram ref no 16
The washer spreads the clamping load from the head nut, helping maintain consistent torque retention and protecting mating surfaces from damage caused by concentrated pressure.
• It’s supplied per washer (price is for each) and 24 washers are required per engine.
It provides a stable, even load surface beneath each head nut, supporting correct tightening and helping the cylinder head fastening system maintain consistent clamp force over time - especially important on engines that see repeated thermal expansion and contraction.
• Distributes head nut load to reduce point-stress on components
• Helps maintain more consistent clamping force as the engine heat-cycles
• Supports proper seating of the head nut for reliable assembly during rebuilds
Old washers can become corroded, deformed, or marked from previous torque cycles. Reusing tired hardware can affect how evenly the head nuts clamp, which can compromise long-term sealing and reliability. Fresh washers help restore proper seating and load distribution during rebuild work.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903109101
99903109101
The product you are viewing cross references to these numbers
Price: €3.54
In stock
Vehicle Group
- 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 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Information
Stud - M8 x 30 / 45mm - which is used to mount the heat exchanger.
This exhaust manifold stud is a high-strength threaded stud used to secure the exhaust manifold (heat exchanger) to the cylinder head on classic air-cooled Porsche 911, Turbo (930), and 964 Turbo models.
Sold individually, 12 required per engine.
Fits:
Porsche 911 Turbo (930) 1978 - 1989
Porsche 911 Carrera 3.2L 1984 - 1989
Porsche 964 Turbo 3.3L 1991 - 1992
Porsche 964 Turbo 3.6L 1993 - 1994
Diagram ref. no. 5A
The exhaust manifold stud forms a critical fastening point that holds the exhaust manifold (or heat exchanger) firmly to the engine’s cylinder head. It ensures the exhaust system components remain tightly seated under heat, vibration, and thermal cycling, preventing exhaust leaks and preserving engine performance.
This stud’s threaded design enables secure engagement with corresponding nuts and manifold flanges. By maintaining proper clamping force, it helps support the manifold gasket and metal mating surfaces, sustaining a leak-free joint under extreme exhaust temperatures and repeated heating/cooling cycles.
Exhaust studs undergo intense heat and stress, which over time can lead to stretching, thread wear, or breakage. A compromised stud can allow exhaust leaks, reduce engine efficiency, and make future removal of the manifold difficult. Replacing them restores correct fit, proper torque retention, and long-term exhaust system reliability.
When to replace:
• Studs show corrosion, thread wear, or distortion
• One or more studs have broken during removal
• Exhaust leak noises at the manifold flange
• During manifold gasket replacement
• Preventive renewal during engine or exhaust overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906223903
The product you are viewing cross references to these numbers
This exhaust manifold stud is a high-strength threaded stud used to secure the exhaust manifold (heat exchanger) to the cylinder head on classic air-cooled Porsche 911, Turbo (930), and 964 Turbo models.
Sold individually, 12 required per engine.
Fits:
Porsche 911 Turbo (930) 1978 - 1989
Porsche 911 Carrera 3.2L 1984 - 1989
Porsche 964 Turbo 3.3L 1991 - 1992
Porsche 964 Turbo 3.6L 1993 - 1994
Diagram ref. no. 5A
The exhaust manifold stud forms a critical fastening point that holds the exhaust manifold (or heat exchanger) firmly to the engine’s cylinder head. It ensures the exhaust system components remain tightly seated under heat, vibration, and thermal cycling, preventing exhaust leaks and preserving engine performance.
This stud’s threaded design enables secure engagement with corresponding nuts and manifold flanges. By maintaining proper clamping force, it helps support the manifold gasket and metal mating surfaces, sustaining a leak-free joint under extreme exhaust temperatures and repeated heating/cooling cycles.
Exhaust studs undergo intense heat and stress, which over time can lead to stretching, thread wear, or breakage. A compromised stud can allow exhaust leaks, reduce engine efficiency, and make future removal of the manifold difficult. Replacing them restores correct fit, proper torque retention, and long-term exhaust system reliability.
When to replace:
• Studs show corrosion, thread wear, or distortion
• One or more studs have broken during removal
• Exhaust leak noises at the manifold flange
• During manifold gasket replacement
• Preventive renewal during engine or exhaust overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99906223903
99906223902
99906223903
The product you are viewing cross references to these numbers
Price: €4.20
In stock
Also found on these pages
-
crankcase 911 1970-73 101-05
-
cylinder head, cylinder with piston 911 UPTO 1971 103-00
-
cylinder head, cylinder with piston 911 1972 ONWARDS 103-05
-
crankcase left 911 1978-83 101-05
-
cylinder head 911 1978-83 103-00
-
crankcase right 911 1978-83 101-10
-
air cooling 911 1978-83 105-00
-
air cleaner 911 SC 1978-83 106-00
-
replacement transmission, transmission case 1978-83 302-00
-
gear housing, transmission cover 1978-83 302-05
-
replacement transmission, transmission case SPM - G 925/16 - 911 1978-83 308-00
-
injection system cylinder head and injection pump 911 E/S UPTO 1971 and 911 911 T-E/E/S, CARRERA 2.7 1972 ONWARDS 107-20
-
vacuum system for clutch release 911 T:SPM UPTO 1971 107-45
-
Vacuum system for clutch release for 911 T-V:SPM 1972 ONWARDS 107-55
-
crankcase left 911 1987-89 101-05
-
crankcase right 911 1987-89 101-10
-
cylinder head 911 1987-89 103-00
-
air cooling 911 1987-89 105-00
-
clutch release hydraulic 911 1987-89 301-07
-
replacement transmission transmission case 911 1987-89 302-00
-
replacement transmission transmission case 911 1987-89 302-02
-
gear housing transmission cover 911 1987-89 302-05
-
gear housing / transmission cover 911 1987-89 302-07
-
Transmission cover transmission suspension chilled casting and die casting for 911 UPTO 1970 302-05
-
Transmission cover, transmission suspension, die casting for 911 1971 302-15
-
Gear housing complete, transmission case front and transmission suspension for 911 1972 ONWARDS 302-25
-
converter and converter housing TYP 905/21 sportomatic for 911 T/E UPTO 1971 and 911 T-V 1972 ONWARDS 306-00
-
Converter and converter housing TYP 925 sportomatic for 911 T-E/E/S and CARRERA 2.7 1972 ONWARDS 306-05
-
transmission case sportomatic for 911 T/E UPTO 1971 307-00
-
transmission case TYP 905/21 sportomatic for 911 T-V 1972 ONWARDS 307-10
-
transmission case sportomatic TYP 925 for 911 T-E/E/S and CARRERA 2.7 and 911 T-K 1972 ONWARDS 307-20
-
Transmission cover, transmission suspension for sportomatic TYP 925 for 911 T-E/E/S, CARRERA 2.7 and 911T-K 1972 ONWARDS 307-25
-
Crankcase left 911 1984-86 101-05
-
Crankcase right 911 1984-86 101-10
-
Cylinder head 911 1984-86 103-00
-
air cooling 911 1984-86 105-00
-
replacement transmission, transmission case 911 1984-86 302-00
-
gear housing, transmission cover 911 1984-86 302-05
-
Crankcase left 911 1974-77 101-05
-
Crankcase right 911 1974-77 101-10
-
Cylinder head cylinder with piston 911 1974-77 103-00
-
Air Cooling 911 1974-77 105-00
-
Mechanical injection right for Model 911/83 1974-77 107-25
-
Gear housing, transmission cover 911 1974-77 302-05
-
Converter converter housing 911 1974-77 SPM 307-05
-
Replacement transmission, transmission case 911 1974-77 SPM 308-00
-
replacement transmission, transmission case chilled casting for 911 T/E/S UPTO 1970 302-00
-
transmission oil pump G >> 783 0870 for 911 CARRERA 2.7 1972 onwards. 302-30
-
Crankcase 911 1965-69 101-05
-
crankcase 912 1965-69 101-10
-
cylinder head, cylinder with piston 911 1965-69 103-00
-
chain case, camshaft housing 911 1965-69 103-10
-
carburettor system - WEBER - M 090 7001 >> for 911 /L/S/TU UPTO 1968 and 911 T 1969 ONWARDS 107-00
-
carburettor system with - SOLEX 40 PI-1 - for 911 UPTO 1968 107-06
-
injection system cylinder head and injection pump for 911 E/S 1969 onwards 107-20
-
vacuum system for clutch release for sportomatic for 911 L/S/TU upto 1968 and 911 T 1969 ONWARDS 107-30
-
replacement transmission, transmission case, chilled casting 911 1965-69 302-00
-
transmission cover, transmission suspension, chilled casting and die casting 911 1965-69 302-05
-
converter and converter housing sportomatic 911 1965-69 306-00
-
transmission case sportomatic 911 1965-69 307-00
-
crankcase left 911 Turbo 1975-77 101-05
-
crankcase right 911 Turbo 1975-77 101-10
-
cylinder head, cylinder with piston 911 TURBO 1975-77 103-00
-
air cooling 911 TURBO 1975-77 105-00
-
K - JETRONIC 911 TURBO 1975-77 107-05
-
replacement transmission, transmission case 911 TURBO 1975-77 302-00
-
gear housing, transmission cover 911 TURBO 1975-77 302-05
-
converter, converter housing SPM - G 925/16 - 911 1978-83 307-05
About Engine Bolts / Studs
OEMatch Engine Bolts / Studs — Durability, Sealing, Performance
Engine bolts and studs are small but essential fasteners that secure cylinder heads, crankcases, connecting rods and manifolds on Porsche models. They maintain sealing, alignment and torque integrity during servicing, rebuilds and performance work; inspect fasteners for stretch, corrosion and thread damage during service.
Understanding OEMatch Engine Bolts / Studs
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original engine bolts / studs.
OE (Original Equipment) refers to parts matching original specifications for the engine bolts / studs and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM engine bolts / studs engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OE (Original Equipment) refers to parts matching original specifications for the engine bolts / studs and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM engine bolts / studs engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Engine fasteners must deliver consistent clamping force while resisting stretching, vibration and corrosion. They secure critical assemblies and preserve internal clearances. OEMatch supplies a wide selection of Porsche components, from gaskets to suspension hardware, engine parts and interior trim. The catalogue includes thousands of part numbers and cross-references and is continually expanded to support maintenance and restoration.
Benefits Include- Consistent clamping force and torque retention to preserve seals and clearances
- High fatigue resistance to resist loosening under repeated torque cycles
- Improved corrosion protection with suitable coatings or materials
- Metal fatigue or stretching from repeated torque applications
- Corrosion and oxidation, especially in high-heat or humid conditions
- Incorrect torque, over-tightening or under-torquing during installation
- Thread wear or damage from debris, cross-threading or improper handling
The Importance of Replacing with OEMatch Engine Bolts / Studs
During an engine rebuild or major service, replacing aged or stressed bolts and studs helps maintain sealing, alignment and torque integrity. Correct-grade fasteners reduce the risk of leaks, distortion and mechanical failure and support reliable long-term operation on Porsche engines. Where critical, follow model-specific specifications for material grade and torque values.Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances for Porsche models
- Available in high-tensile and corrosion-resistant finishes to suit application requirements
- Precision threads for repeatable installation and reliable torque control
You may also like
-
Intermediate shaft (IMS)
-
Oil System Parts
-
Fuel System Parts
-
Gaskets & Sets
-
Radial Seal / RMS / Camshaft / Balance shaft
-
Belts / Tensioners / Rollers
-
Chains & Tensioners
-
Timing covers and gaskets
-
Engine Bearings / Shells
-
Engine Valves / Guides / Springs
-
Rocker Arms & Tappets
-
Engine Mounts
-
Piston Rings
-
Engine Cylinders / Liners / Pistons
-
Connecting Rod
-
Cylinder Head / Camshaft Carrier
-
Camshaft covers / Gaskets
-
Camshafts
-
Camshaft gears / sprockets and fixings
-
Crankcase Parts
-
Crankshaft & Parts
-
Engine Tinware
-
Turbo Chargers / Intercoolers & Parts
-
Air Intake & Injection
-
Carburetors & Parts
-
Vacuum Pump
-
Specialist Tools
Popular Models
