Crawford Street Spec CSS 540 — 450whp / 540bhp

The CSS 540 Street Spec Cylinder Head Service is built for Subaru owners who need more than stock. Engineered for builds targeting up to ~450 whp (≈540 bhp crank), it delivers OEM+ reliability, efficient airflow, and clean sealing—perfect for street cars that see the occasional track day.

If your factory heads are worn, damaged, or just not keeping up with modern tuning, CSS 540 gives you freshly prepped heads using the same race-proven methods we’ve used in Subaru motorsport programs. It’s a rock-solid foundation for moderate turbo upgrades and spirited driving.

What’s Included

• Full disassembly & cleaning

• Warpage & thickness check

• Pressure test of both heads

• R&R 16 valve guides

• OHC bucket valve adjustment

• 3-angle valve job for improved airflow

• Precision resurface for sealing reliability

• Final assembly with heat tab

Best for: WRX/STI EJ builds, moderate turbo upgrades, street/track crossover
Target: Up to ~450whp (≈540bhp crank) with proper turbo, fuel, and tune
Price: $1,495 service (does not include cylinder heads—add new OEM castings or send in yours)

Why Choose Crawford CSS 540

• OEM+ reliability with upgraded, proven processes

• Balanced airflow and seat geometry for smooth, efficient power

• Race-proven machining & assembly—tight, repeatable tolerances

• Built to Crawford Performance motorsport standards

Notes: Service is for a pair of heads. Compatible with EJ-series WRX/STI applications (e.g., EJ205/255/257). Valves, springs/retainers, cams, and AVCS components can be added per your build plan.