RCM 14/12mm Cylinder Head Stud Kit EJ20/22/25


  • Huge increase in tensile strength and yield when compared with the OE head bolts.


Part Number: RCM157

Designed for the ultimate in engine performance and reliability and derived from the rigors of the World Rally Championship, RCM’s 14mm/12mm Head Stud Kit has consistently proven itself as a must have component of any EJ20/22/25 engine build where 450bhp+ 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 14/12mm Head Stud kit provides this peace of mind and cuts out the expense of cylinder head modification when compared to the WRC 14/14mm head stud kit.

Now used in many of the fastest and most powerful Impreza’s across the globe the RCM 14/12mm Head Stud Kit is quite simply the foundation on which many of our high bhp engine conversions are built around. Replacing the conventional 11mm Subaru cylinder head bolts with a series of 14/12mm 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 successful engines run these kits!

Technical Specifications

  • Cylinder head studs manufactured using “Aircraft Grade S99 High Tensile Steel

Confirmed Applications

Suitable for all EJ20/22/25 series block cases.

Additional information

Weight 9 lbs
Dimensions 10 × 7 × 7 in


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