Designed for the ultimate in engine performance and reliability and derived from the rigors of the World Rally Championship, RCM’s 14mm/14mm Head Stud Kit has consistently proven itself as a must-have component of any EJ20/22/25 engine build where 500bhp+ power output is expected.
It is essential engines modified to this level have the most reliable system for clamping the cylinder heads onto the block assembly to avoid the heads lifting under load at high levels of boost pressure. The RCM 14/14mm Head Stud kit provides this peace of mind!
Now used in many of the fastest and most powerful Imprezas across the globe the RCM 14/14mm Head Stud Kit is quite simply the foundation on which all our high bhp engine conversions (including Gobstopper 1, 2 & 3) race engines are built around.
Replacing the conventional 11mm Subaru cylinder head bolts with a series of 14mm precisely manufactured super high tensile, aircraft grade S99 steel stud and nut system offers many advantages when building your engine. With a tensile strength much higher than that of the OE bolts and the increased stability provided by the RCM studs larger diameter when further combined with the more uniform clamping force provided by the stud and nut arrangement it is clear why so many championship-winning engines run these kits!
All kits are supplied with RCM’s own assembly lube, which utilizes Graphite DJ technology, ensuring you are able to install to the correct torque figures accurately.
TECHNICAL SPECIFICATION
- Cylinder head studs manufactured using “Aircraft Grade S99 High Tensile Steel” to WRC specification.
- Precision rolled threads.
- Cylinder head stud thread pitch (Block): M14X2.
- Cylinder head stud thread pitch (Cylinder Head end): M14X1.5.
- Cylinder head stud length: 197mm.
Kits is comprised of:
x12 RCM 14mm head studs.
x12 high tensile nuts.
x1 Sachet of Moly Grease.
x1 Fitting Instruction Guide.
To allow fitting of the RCM 14/14mm Head stud kit your engine block must be re-engineered to accept the larger studs used in this kit. You will also need specific head gaskets for this size as well.
Due to the increased diameter of the cylinder head stud machining is required to the cylinder heads. The original head bolt passages must be drilled out to a larger diameter in order for the 14mm stud to pass through.
4x RCM2726 modified head location dowels are required when using this kit, LINKED HERE.
KEY FEATURES
- Huge increase in tensile strength and yield when compared with the OE head bolts.
- Massively increased clamping load for big bhp applications.
- Eliminates cylinder head lift at high levels of boost.
- Supplied with ARP high tensile nuts, washers, RCM assembly lube and installation guide
- As used in RCM Gobstopper I + II Time Attack race cars.
CONFIRMED APPLICATIONS
All EJ20, EJ22 & EJ25 engines. If you are unsure of fitment then please check your engine code or contact our sales department.
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