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Case Bolts

ARP case and through bolts are high-performance fasteners that are designed to replace the factory case and through bolts in a Porsche engine. They are made from a special alloy steel that is heat-treated to increase its strength and durability. The case and through bolts are longer than the factory bolts, providing a more secure and stable connection between the engine case and the main bearings.

In a Porsche engine, ARP case and through bolts are recommended because they provide a higher level of safety and reliability. They can help to prevent engine failures caused by stretched or broken case and through bolts, which can lead to serious damage to the engine and other components like main bearing saddle fretting. Additionally, ARP case and through bolts can help to increase horsepower and torque by reducing the amount of flex in the engine case, allowing the engine to make more power reliably.

Overall, using ARP case and through bolts in a Porsche engine can provide a number of benefits, including increased performance, improved reliability, and enhanced safety. They are a recommended upgrade for anyone looking to build a high-performance Porsche engine, particularly for those who are looking to increase the boost in their turbocharged engines and are looking to increase the RPMs of their engines. This is especially beneficial for engines that will see track or race use.

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  1. ARP Engine Case Thru-Bolt Kit for Porsche 914 912E VW Type 2/4

    SKU: 204-01

    $299.00
    LN Engineering exclusive ARP VW Type 2/4 and Porsche 914 912E Engine Case Through Bolt Kit. Includes 6 studs, 12 nuts and washers, and ARP lube. Designed as a direct replacement for the factory through bolts and does not require any modifications to the crankcase and is recommended for all performance engine builds. Learn More
  2. ARP 204-2801 Porsche Late 911 9 pc Flywheel Bolt Kit 1978-98 Porsche 911 3.0-3.8L

    SKU: 204-2801

    $68.99
    ARP 204-2801 Porsche Late 911 9 pc Flywheel Bolt Kit 1978-98 Porsche 911 3.0-3.8L Pro Series flywheel bolts from ARP give you all that you need to bolt in your flywheel with confidence. ARP 204-2801 replaces the factory Porsche flywheel bolt, part number 93010220600. They're much stronger than OEM hardware, forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature an exclusive, flat 12-point head design and a larger-than-stock shank diameter for increased strength and improved flywheel register.

    Installation Method for Porsche Flywheel Bolt Kit

    Part Number: 204-2801
    Application: Porsche E 3.0L-3.8L (1978-97) M10 Flywheel Bolt without Washer

    1. Please check the part-number(s) for your application against the part-number(s) listed on the instruction sheet.
    2. DO NOT USE ANY WASHERS with ARP Flywheel Bolts. They are designed to be installed without them. Note: ARP will NOT be responsible for any failures resulting from using a washer with this kit.
    3. Make sure there is an adequate chamfer around the bolt holes on the flywheel to clear the radius under the head of the bolt.
    4. Lubricate the threads of the bolt with LOCTITE 242 and the under head of the bolt with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the flywheel onto the crankshaft and tighten the bolts hand tight.
    5. Using an alternating or criss cross pattern torque the bolts to 70 ft lbs using the specified lubricants in Step 4.
    Learn More
  3. ARP 204-2802 Porsche Early 911 6 pc Flywheel Bolt Kit 1970-77 Porsche 911 2.0-3.0L

    SKU: 204-2802

    $37.99
    ARP 204-2802 Porsche Early 911 6 pc Flywheel Bolt Kit 1970-77 Porsche 911 2.0-3.0L Pro Series flywheel bolts from ARP give you all that you need to bolt in your flywheel with confidence. ARP 204-2802 replaces the factory Porsche flywheel bolt, part number 91110217100. They're much stronger than OEM hardware, forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature an exclusive, flat 12-point head design and a larger-than-stock shank diameter for increased strength and improved flywheel register. Early Porsche 911 ARP flywheel bolt kit for 2.0, 2.2, 2.4, 2.7, and 3.0L Porsche 911 engines (excluding Sportomatic). Also fits 1970-71 Porsche 914-6 models.

    Installation Method for Porsche Flywheel Bolt Kit

    Part Number: 204-2802
    Application: Porsche 2.0L-3.0L (1970-77) M12 Flywheel Bolt without Washer

    1. Please check the part-number(s) for your application against the part-number(s) listed on the instruction sheet.
    2. DO NOT USE ANY WASHERS with ARP Flywheel Bolts. They are designed to be installed without them. Note: ARP will NOT be responsible for any failures resulting from using a washer with this kit.
    3. Make sure there is an adequate chamfer around the bolt holes on the flywheel to clear the radius under the head of the bolt.
    4. Lubricate the threads of the bolt with LOCTITE 242 and the under head of the bolt with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the flywheel onto the crankshaft and tighten the bolts hand tight.
    5. Using an alternating or criss cross pattern torque the bolts to 95 ft lbs using the specified lubricants in Step 4.
    Learn More
  4. ARP 204-5001 M96/M97 Carrier Through Bolt Kit Porsche Boxster, Cayman, 911

    SKU: 204-5001

    $122.99
    Porsche 986/987/996/997 Crankshaft Carrier Through Bolt Kit. The factory carrier bolts are torque to yield (TTY) and must be replaced. This ARP crankshaft carrier thru-bolt kit features bolts that are stronger (and reusable) to help prevent shuffling and fretting of the main bearing saddles common to engines that see high performance driving or have been increased in displacement. Optional for street and required for the track. We also recommend using coated main and rod bearings on all Boxster, Cayman, and 911 models with the M96/M97 engine for reduced wear and longer bearing life, not to mention an additional layer of protection against oil starvation and aeration related damage.

    Installation Method for Porsche Main Bolt Kit

    Part Number: 204-5001
    Application: Porsche 3.4L-3.6L (Non Turbo) Water-Cooled Engines

    1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase the threads if necessary.
    2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages plus proper fit, length, and dimension.
    3. Make sure there is an adequate chamfer around the bolt holes on the main bearing cap housing to clear the radius on the under head of the bolt.
    4. Install the bearings and the crankshaft into the main bearing housing and assemble the housing halves according to the Porsche factory service manual. Check for binding or misalignment.
    5. Lubricate the under head of the bolt and the bolt threads with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the bolts into the main bearing housing and tighten them hand tight. ARP recommends using the ARP ULTRA-TORQUE FASTENER LUBRICANT that is provided with each kit as opposed to motor oil. This is due to higher friction on the bolts as well as inconsistencies in the clamping force of the fasteners when motor oil (or low quality lubricant) is used.
    6. Following the manufacturer's recommended torque sequence, tighten the bolts in three equal steps to 50 ft-lbs with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.
    7. When changing from factory fasteners to high-strength fasteners, clamping force and tolerances will change; therefore, it will be necessary to check the main bearing bores for proper size and out-of-round condition after installation of the bolts and align hone the cylinder block if necessary. The main bores should always be align honed using the same fasteners and lubricant which will be installed during final engine assembly at the recommended preload.
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  5. ARP 204-5405 Porsche 911 3.0, 3.2, & 3.3 Crankcase Thru-Bolt Kit

    SKU: 204-5405

    $1,095.99
    ARP 204-5405 Porsche 911 3.0, 3.2, & 3.3 Crankcase Thru-Bolt Kit Fits 3.0, 3.2, and 3.3 liter Porsche 911 engines from 1978-1989 (and 964 Turbo models with the 3.3L engine).

    Installation Method for Porsche Crankcase Thru-Bolt Kits

    Part Number: 204-5405
    Application: 3.0L-3.3L air-cooled engines

    Note: The O-rings required to seal the crankcase thru-bolt holes (indicated in steps 7 and 8) are available from Porsche and many aftermarket suppliers and are typically supplied in most engine gasket kits.

    1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the engine case. Chase if necessary with ARP Thread Chaser(s), part number 912-0005 (M11 X 1.5).
    2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length, and dimension.
    3. Install two 6.835 in. long studs into the left-hand case on the No. 1 main bearing journal.
    4. Install one 4.553 in. long stud into the lower hole of the right-hand case on the No.7 main bearing journal.
    5. Screw the studs into the engine case "HAND TIGHT ONLY". Note: Loctite may be used if permanent mounting of the stud is preferred.
    6. Assemble the case halves as described in the Porsche Factory Service Manual. Check for binding or misalignment.
    7. Working from the side of the right-hand case, install one O-ring over each of the studs on the No.1 main bearing journal. Then install a double chamfered washer onto each of the studs on the No.1 main bearing journal making sure the large I.D. chamfer faces the engine case.
    8. Assemble the thru-bolts as follows:
      a) Install a double chamfered washer onto each thru-bolt and slide it up to the bolt head. The washers must be positioned on the bolt so that the large I.D. chamfer on the washer faces the engine case.
      b) Install one O-ring over each bolt and position it up against the large I.D. chamfer on each washer.
      c) Install the eleven thru-bolts into position through the right-hand case.
      d) Working from the side of the left-hand case, install one O-ring over the end of each thru-bolt. Be sure to push the O-rings up against the engine case. Then install a double chamfered washer over the end of each thru-bolt making sure the large I.D. chamfer on the washer faces the engine case.
    9. Lubricate the stud threads, bolt threads, and nuts with Permatex 133A Anti Seize compound. DO NOT USE ANY OTHER THREAD LUBRICANT AS GALLING MAY OCCUR.
    10. Install the standard (black oxide) 12 pt nut and washer onto the 4.553 in. long stud of the No.7 main bearing journal through the opening in the chain housing on the left-hand case.
    11. Install the cap nuts onto the eleven thru-bolts and the two studs securing the No.1 main bearing journal. Tighten the nuts hand tight.

    Preload (Torque) Recommendations

    Torque values are based on 75% of the fasteners' yield strength. Following the manufacturer's recommended torque sequence, tighten the nuts to 25 ft lbs with Permatex 133A Anti Seize compound.

    Note: Use only Permatex 133A Anti Seize compound or severe galling may occur.

    Learn More
  6. ARP 204-5406 Porsche 911 3.6 3.8 964 & 993 Crankcase Thru-Bolt Kit

    SKU: 204-5406

    $1,197.99
    ARP 204-5406 Porsche 911 3.6 3.8 964 & 993 Crankcase Thru-Bolt Kit Fits all 3.6 and 3.8 liter Porsche engines from 1989-1998.

    Installation Method for Porsche Crankcase Thru-Bolt Kits

    Part Number: 204-5406
    Application: 3.6L & 3.8L air-cooled engines

    Note: The O-rings required to seal the crankcase thru-bolt holes (indicated in steps 7 and 8) are available from Porsche and many aftermarket suppliers and are typically supplied in most engine gasket kits. Also note that this is a Universal kit that fits all 3.6L & 3.8L engines produced from 1989-98.

    1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the engine case. Chase the threads if necessary with ARP Thread Chaser(s), part number 912-0005 (M11 X 1.5) or 912-0003 (M10 x 1.5).
    2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length and dimension.
    3. On early model engines, install two 6.973 in. long (M11x M10) studs into the left-hand case on the No.1 main bearing journal.
    4. On all engines, install one 4.553 in. long stud into the lower hole of the right-hand case on the No.7 main bearing journal.
    5. Screw the studs into the engine case "HAND TIGHT ONLY". Note: Loctite may be used if permanent mounting of the stud is preferred.
    6. Assemble the case halves as described in the Porsche Factory Service Manual. Check for binding or misalignment.
    7. a) On early model engines, working from the side of the right-hand case, install one O-ring over each of the studs on the No.1 main bearing journal. Then install a stepped washer onto each of the studs on the No.1 main bearing journal making sure the large O.D. on the washer faces the nut.
      b) On later model engines, it will be necessary to install one stepped washer and one O-ring on the end of two 6.170 long (M 10) bolts and slide them up to the bolt heads. Then apply a liberal amount of anti-seize compound to the bolt threads and install the bolts through the right-hand case on the No.1 main bearing journal.
    8. Assemble the thru-bolts as follows:
      a) Install a stepped washer onto each thru-bolt and slide it up to the bolt head. The washers must be positioned on the bolt so that the large O.D. on the washer faces the bolt head. Install one O-ring over each bolt and position it up against the washer.
      b) Install the eleven thru-bolts into position through the right-hand case.
      c) Working from the side of the left-hand case, install one O-ring over the end of each thru-bolt. Be sure to push the O-rings up against the engine case. Then install a stepped washer over the end of each thru-bolt making sure the large O.D. on the washer faces the nut.
    9. Lubricate the stud threads, bolt threads and nuts with Permatex 133A Anti-Seize compound. DO NOT USE ANY OTHER THREAD LUBRICANT AS GALLING MAY OCCUR.
    10. Install the standard (black oxide) 12 pt nut and washer onto the 4.553 in. long stud of the No.7 main bearing journal through the opening in the chain housing on the left-hand case.
    11. Install the nuts onto the eleven thru-bolts. On early models, install two nuts on the studs securing the No.1 main bearing journal. Tighten the nuts hand tight.
    12. Preload (Torque) Recommendations: Torque values are based on 75% of the fasteners' yield strength. Following the manufacturer's recommended torque sequence, tighten the nuts to 37 ft lbs with Permatex 133A Anti-Seize compound. Note: Use only Permatex 133A Anti-Seize compound or severe galling may occur.
    Learn More
  7. ARP 204-5407 Porsche 911 2.0, 2.2, 2.4, & 2.7 Crankcase Thru-Bolt Kit

    SKU: 204-5407

    $1,073.99
    ARP 204-5407 Porsche 911 2.0, 2.2, 2.4, & 2.7 Crankcase Thru-Bolt Kit Fits 2.0 through 2.7 liter Porsche 911 engines from 1965-1977.

    Installation Method for Porsche Crankcase Thru-Bolt Kits

    Part Number: 204-5407
    Application: 2.0L-2.7L air-cooled engines

    Note: The O-rings required to seal the crankcase thru-bolt holes (indicated in steps 7 and 8) are available from Porsche and many aftermarket suppliers and are typically supplied in most engine gasket kits.

    1. To ensure proper thread engagement and accurate torque readings clean ALL threads in the engine case. Chase if necessary with ARP Thread Chaser(s), part number 912-0003 (M10 X 1.5).
    2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length and dimension.
    3. Install two 6.835 in. long studs into the left-hand case on the No. 1 main bearing journal.
    4. Install one 4.553 in. long stud into the lower hole of the right-hand case on the No.7 main bearing journal.
    5. Screw the studs into the engine case “HAND TIGHT ONLY”. Note: Loctite may be used if permanent mounting of the stud is preferred.
    6. Assemble the case halves as described in the Porsche Factory Service Manual. Check for binding or misalignment.
    7. Working from the side of the right-hand case, install one O-ring over each of the studs on the No.1 main bearing journal. Then install a double chamfered washer onto each of the studs on the No.1 main bearing journal making sure the large I.D. chamfer faces the engine case.
    8. Assemble the thru-bolts as follows:
      a) Install a double chamfered washer onto each thru-bolt and slide it up to the bolt head. The washers must be positioned on the bolt so that the large I.D. chamfer on the washer faces the engine case.
      b) Install one O-ring over each bolt and position it up against the large I.D. chamfer on each washer.
      c) Install the eleven thru-bolts into position through the right-hand case.
      d) Working from the side of the left-hand case, install one O-ring over the end of each thru-bolt. Be sure to push the O-rings up against the engine case. Then install a double chamfered washer over the end of each thru-bolt making sure the large I.D. chamfer on the washer faces the engine case.
    9. Lubricate the stud threads, bolt threads and nuts with Permatex 133A Anti-Seize compound. DO NOT USE ANY OTHER THREAD LUBRICANT AS GALLING MAY OCCUR.
    10. Install the standard (black oxide) 12 pt nut and washer onto the 4.553 in. long stud of the No.7 main bearing journal through the opening in the chain housing on the left-hand case.
    11. Install the cap nuts onto the eleven thru-bolts and the two studs securing the No.1 main bearing journal. Tighten the nuts hand tight.
    12. Preload (Torque) Recommendations: Torque values are based on 75% of the fasteners yield strength. Following the manufacturer's recommended torque sequence, tighten the nuts to 25 ft lbs with Permatex 133A Anti-Seize compound. Note: Use only Permatex 133A Anti-Seize compound or severe galling may occur.
    Learn More
  8. ARP 204-5410 Porsche 911 3.6 964 Crankcase Bolt Kit

    SKU: 204-5410

    $978.99
    ARP 204-5410 Porsche 911 3.6 964 Crankcase Bolt Kit Install and torque to factory specifications. Learn More
  9. ARP 504-9501 Porsche 911 & 930 Turbo Crankcase Stud Kit

    SKU: 504-9501

    $912.99
    ARP 504-9501 Porsche 911 & 930 Turbo Crankcase Stud Kit Fits Porsche 911 2.7L to 3.2L & 930 3.3L models. Install and torque to factory specifications. Learn More
  10. ARP 504-9502 Porsche 911 & 930 Turbo Transmission Mount Stud Kit

    SKU: 504-9502

    $101.99
    ARP 504-9502 bellhousing / transmission / gearbox mount stud kit for Porsche 911 & 930 models from 2.7L to 3.2L & 930 3.3L. Learn More
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