Cylinder Heads

This 14mm/12mm head stud kit from RCM uses aircraft-grade S99 steel studs to replace the standard 11mm Subaru head bolts, offering higher tensile strength and clamping force. Source material describes it as suited to higher-output EJ20/22/25 builds.

SKU: RCM157

This 14mm/14mm head stud kit from RCM uses aircraft-grade S99 steel studs to replace the standard 11mm Subaru head bolts, offering higher tensile strength and clamping force. Source material describes it as suited to higher-output EJ20/22/25 builds.

SKU: RCM593

This Extreme 11mm head stud kit from RCM (reference RCM1540) uses aircraft-grade S99 steel studs with a manufacturer-stated tensile strength in excess of 237,000 psi (1640 MPa). Supplied with RCM assembly lubricant. Vehicle fitment needs confirmation.

SKU: RCM1540

This 11mm performance head stud kit from RCM replaces the standard cylinder head bolts on Subaru EJ-series engines. Made from S99 steel with a manufacturer-stated minimum yield strength of 1080 MPa, supplied with ARP nuts, washers and RCM assembly lubricant.

SKU: RCM1635

Modified head dowels designed for use with 14mm head stud kits (reference RCM2902 and RCM593). Precision-cut and opened to fit over the larger 14mm stud shank. Supplied as a set of 4.

SKU: RCM2726

These billet aluminium half moon seals (also called cylinder head plugs) replace the OE plastic seals on Subaru EJ-series engines, which can harden and leak over time. Sealed using SGA35 liquid gasket. A complete engine requires 4 seals; sold as x1 or x4.

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This blanking plate kit from RCM fits applications where the standard oil filler neck is no longer used, such as dry-sump conversions using an external oil tank. Available for V1-V4 and V5+ EJ-series engines.

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This service refinishes Subaru rocker covers in STI-style crinkle paint, available in Red or Black. Covers are cleaned and stripped before recoating; customers must send in their own rocker covers to proceed.

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This Superstud head stud kit from RCM (14mm/14mm) uses a larger 9/16″ diameter stud made from aircraft-grade S99 steel for Subaru EJ-series engines. Supplied with 12x ARP 9/16″ 8740 chromoly nuts and washers and compatible with RCM head gaskets.

SKU: RCM2902

This Superstud head stud kit from RCM (14mm/12mm) is made from aircraft-grade S99 steel for Subaru EJ-series engines. Supplied with 12x ARP M12x1.25 8740 chromoly nuts and washers and compatible with RCM head gaskets.

SKU: RCM2903