Cylinder Heads

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…

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…

The RCM1540 Extreme 11mm Head Stud kit is an absolute must for your performance build. Manufactured from Aircraft Grade S99 Steel, and with a tensile strength in excess of 237,000 Psi (1640MPa), our 11mm kit reduces head movement under boost, and provides optimum head to block clamping, ably dealing with the higher combustion pressures associated…

The RCM 11mm Performance Head Stud Kit is the perfect addition to any high performance engine build. Manufactured from S99 Steel with a certified minimum yield strength of 1080 MPa our new Performance Studs offer a substantially greater force on your cylinder head gaskets when compared to the O.E cylinder head bolts. With a greater…

RCM’s own modified head dowel, for use with our Uprated 14mm heads stud kits RCM2902 & RCM593. Our dowels are each precision cut and opened, which allows them to fit over the shank of the larger 14mm stud, they can then be simply squeezed sut and tapped into place. Each kit includes x4 dowels. A…

The RCM Billet Half Moon seals (also known as cylinder head plugs) have been specifically designed to replace the problematic OE plastic seals which become hardened and brittle with the constant temperature changes, eventually leaking and requiring replacement again. Manufactured from high grade aluminium, these RCM engraved replacements will not suffer from these issues. Fitting…

The RCM oil filler blanking kit has been designed to be installed on applications where engine oil is no longer poured into the engine via the normal oil filler neck, for example where a dry sump system has been installed which uses an oil storage tank.

We are now able to offer a refurbishment service on any Subaru rocker cover. Upon receipt of your rocker covers, we will thouroughly clean and strip them before coating them with “STI Crinkle Paint”, offering the same finish as the STI Red manifolds, or in the same Crinkle Paint but the Black option. This is…

The latest evolution of our proven and hugely successful 14/14mm RCM Head Stud Kit designed for the ultimate in engine performance and reliability! Introducing the new RCM 14mm Superstud Head Stud Kit. Our engineers have taken the ultimate EJ series head stud solution to the next level by incorporating some new features into the RCM…

The latest evolution of our proven and hugely successful 14/12mm RCM Head Stud Kit designed for the ultimate in engine performance and reliability! Introducing the new RCM 14mm Superstud Head Stud Kit. Our engineers have taken the ultimate EJ series head stud solution to the next level by incorporating some new features into the RCM…