Exhaust Header Stud Set
Upgrade your exhaust hardware and ensure a leak-free seal with our premium header mounting stud set. Factory exhaust manifold studs feature a center shoulder that frequently interferes with the thicker flanges of performance headers, preventing proper clamping force. These high=strength, heat-treated, and plated 10mm x 1.25 x 48mm studs resolve this issue completely, offering superior tensile strength over stock hardware. Whether you are running a standard factory manifold or an aftermarket performance header, this kit provides a more durable, reliable mounting solution.
Key Features & Technical Specifications
- Anti-Interference Design: Engineered without a center shoulder to allow full, unhindered clamping force across the exhaust flange.
- Heavy-Duty Construction: Heat-treated and corrosion-resistant plated finish for maximum durability under extreme exhaust temperatures.
- Universal Application: Fully compatible with factory Toyota exhaust manifolds and all styles of aftermarket headers.
Kit Includes
- (8) High-Strength Header Studs
- (8) Mechanical Locking Nuts
Installation & Torque Notes
- Installation Orientation: When threading the hardware into the cylinder head, ensure the short-threaded side of the stud is inserted into the head.
- Torque Specification: Tighten all nuts in a progressive sequence to 33 ft-lbs using a calibrated torque wrench. Do not over-torque.
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- 1975-1980 20R 2.2L Engines
- 1981-1995 22R 2.4L Engines
- 1983-1995 22RE 2.4L Engines
- 1995.5-2004 2RZ 2.4L Engines
- 1995.5-2004 3RZ 2.7L Engines
CLICK HERE to view or print the installation instructions (PDF)
Technical Installation Instructions
1. Old Hardware Removal
- Disassembly: Remove the original exhaust manifold studs from the cylinder head.
- Pro Tip: If the factory studs are seized or difficult to break loose, apply a high-quality penetrating lubricant (such as WD-40 Specialist, PB Blaster, or Kroll) to the threads and allow it to soak overnight before attempting removal to prevent snaping the hardware in the head.
2. Stud Installation & Orientation
- Orientation: Identify the shorter threaded portion of the new performance stud. This is the end that must be threated directly into the cylinder head.
- Tightening: Thread the studs into the cylinder head until they bottom out. They should only be installed hand-tight.
3. Exhaust Manifold/Header & Torque Procedure
- Gasket Preparation: Position your exhaust gasket and header onto the studs. Note: LC Engineering performance headers and exhaust gaskets are engineered to seal perfectly dry-they do not require the use of any RTV or silicone sealants.
- Optional Sealant: If you choose to utilize a chemical sealant anyway, you must ensure it is explicitly rated as Oxygen Sensor Safe to prevent damaging your vehicle's emissions sensors.
- Torque Specification: Install the included mechanical locking flange nuts and torque them in a progressive sequence to 33 ft-lbs.
Double-Nut Installation & Removal Technique
If you do not own a dedicated stud installation/removal socket, you can easily manage the hardware using two standard metric nuts:
- Thread the Nuts: Thread one 10mm x 1.25 nut halfway down the open side of the stud. Thread a second 10mm nut down right on top of it until the two nuts sit flush against each other.
- Lock Them Together: Place a box wrench on each nut and tighten them firmly against one another in opposing directions. This locks the nuts together onto the stud threads.
- Removal: To back a stubborn stud out of the head, place your wrench on the inner nut (the one closest to the engine block) and turn counterclockwise. The locked nuts will transfer the rotational force and turn the stud out.
- Installation: To seat a new stud into the head, place your wrench on the outer nut (the one furthest from the engine block) and turn clockwise until the stud is hand-tight in the block.
- Unlock: Once completed, use your two wrenches to loosen the nuts from each other and spin them off the stud.