550 Street Cylinder Head Package

The IAG Performance 550 Street Cylinder Head Package is designed as an entry-level replacement for stock OEM heads. This package is suitable for engines that have suffered catastrophic failure or for builds requiring new cylinder heads. It is also a good option for vehicles with basic bolt-on modifications and a power target of up to 550 BHP.

Each set begins with brand-new Subaru OEM WRX or STI cylinder head castings. The package includes a multi-angle valve job, machined cam lobe clearance, resurfaced decks, and ultrasonic cleaning. It comes with GSC 36mm intake valves, GSC 32mm exhaust valves, IAG Stage 1 valve springs with titanium retainers, and GSC Viton valve stem seals.