Engine

The RCM600 2.1L High Compression Closed Deck Block Short Engine is a high-compression Subaru EJ-series short engine assembled by RCM, built around a closed deck block in 2.1L configuration. Each unit is finished with an individual build tag recording its specification, builder and date. Please contact Scooby Upgrades to confirm exact vehicle and engine compatibility…

The RCM500 2.1L High Compression Closed Deck Block Short Engine is a high-compression Subaru EJ-series short engine assembled by RCM, built around a closed deck block in 2.1L configuration. Each unit is finished with an individual build tag recording its specification, builder and date. Please contact Scooby Upgrades to confirm exact vehicle and engine compatibility…

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.

RCM V3/4 uprated valve springs, offering an increased spring rate over the standard genuine spring to help reduce valve bounce at high revs. Unfitted length 54mm, coil diameter 3.8mm, approx. 48g each; seat pressure 33kgf, lift pressure 72.8kgf. Uses the standard spring seat and retainer.

Injector adaptor kit allowing later Version 5–6 injectors to be fitted into earlier V1–V4 side feed fuel rails, for Subaru Impreza GC/GF (1992–2000). Injectors not included.

RCM Powerparts performance camshaft kit for dual-AVCS Subaru STI V10 applications, covering Impreza/WRX STI (GR/GV) and WRX STI (VA/VAB) models. Please contact Scooby Upgrades for full specification and kit contents, and to confirm fitment, before ordering.

RCM nitrided steel spring seat spacers for V5+ cylinder heads. Please confirm compatibility with your specific engine and valve spring setup before ordering.

RCM nitrided steel spring seat spacers for V3/4 cylinder heads, for use only with the RCM double valve spring kit (RCM906). Please confirm compatibility with your specific engine setup before ordering.

RCM titanium valve spring retainers, supplied as a set of 16. For use with RCM double valve springs and later-style buckets with integrated shims. Please confirm compatibility with your engine before ordering.

RCM V5/6 uprated valve springs, offering an increased spring rate over the standard Subaru spring to help reduce valve bounce at high revs. Unfitted length 43.5mm, coil diameter 3.8mm, approx. 40g each. Fits Subaru Impreza (GC/GF), V5/6.