Cosworth Cylinder Heads

Over the last 50 years Cosworth have developed an in-depth knowledge of engines, electronics and a range of high performance technologies. This has been used to supply some of the most successful motor sport teams and vehicle manufacturers in history.

Our unprecedented success has fueled customer demand globally from diverse market sectors designing and developing technologies and components for aerospace, automotive, defense and sport applications.

	Name	View more
	Cosworth Big Valve Cylinder Head Subaru WRX STI 2.5L EJ25 04-12  Model Number: KK3670   View Price Cosworth Big Valve Cylinder Head Subaru WRX STI 2.5L EJ25 04+Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm...
	Cosworth Big Valve Cylinder Head Mitsubishi EVO VII-VIII 2.0L 4G63 00-05  Model Number: KK3672   View Price Cosworth Big Valve Cylinder Head Mitsubishi EVO VII-VIII 2.0L 4G63 00-05Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max...
	Cosworth Big Valve Cylinder Head Mazda Miata MZR 2.0L 2.3L 06-12  Model Number: 20000704   View Price Cosworth Big Valve Cylinder Head Mazda Miata MZR 2.0L 2.3L 06+Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rp...
	Cosworth Big Valve Cylinder Head Nissan 350Z VQ35 3.5L Rev Up 02-06  Model Number: KK3918   View Price Cosworth Big Valve Cylinder Head Nissan 350Z VQ35 3.5L Rev Up 2006Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,50...
	Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 04-06  Model Number: SB8010   View Price Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 04-06Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi re...
	Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 2007  Model Number: 20002024   View Price Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 2007Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev...
	Cosworth Big Valve Cylinder Head Mitsubishi EVO IX 2.0L 4G63 MIVEC 2006  Model Number: KK3852   View Price Cosworth Big Valve Cylinder Head Mitsubishi EVO IX 2.0L 4G63 MIVEC 2006The Cosworth CNC ported cylinder head for the EVO 9 (with Mivec) features dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a perf...
	Cosworth Big Valve Cylinder Head Subaru WRX STI 2.5L EJ25 2007  Model Number: 20001699   View Price Cosworth Big Valve Cylinder Head Subaru WRX STI 2.5L EJ25 2007Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rp...
	Cosworth CNC Ported Big Valve Cylinder Head Ford Duratec 2.0L / 2.3L 01-12  Model Number: 20000691   View Price Cosworth has been modifying Ford four cylinder engines since 1959 and the practice continues with the Ford Duratec/Mazda MZR. The Duratec/MZR was designed as a replacement for the Zetec engine and was developed as joint collaboration with Ford and Mazda. The lightweight engine features a cast aluminum reinforced block and main bearing girdle that help reduce vibration and improve overall rigidity.The Duratec is an excellent, affordable building block for high performance use and perfect for Lotu...
	Cosworth Big Valve Cylinder Head Ford Focus 2.0L 2.3L Duratec 03-07  Model Number: 20000691   View Price Cosworth Big Valve Cylinder Head Ford Focus 2.0L & 2.3L Duratec 03-07The Cosworth Duratec CNC ported Big Valve cylinder head is the result of countless hours of development and testing. Starting with fresh large port castings, we precision machine both intake and exhaust ports to maximize flow. We then reshape the combustion chamber to un-shroud the the larger stainless steel valves. The head is then assembled using our hi-rev tapered springs along with new valve stem seals and retainers. This c...
	Cosworth Big Valve Cylinder Head Subaru WRX STI EJ25 2.5L 08  Model Number: 20004544   View Price Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm) valve springs with titanium retainers and are ready to insta...
	Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 07  Model Number: 20002026   View Price Cosworth Big Valve Cylinder Head with Camshafts Subaru WRX STI EJ25 2.5L 07Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (...
	Cosworth Big Valve Cylinder Head Mitsubishi EVO X 08-12  Model Number: 20005685   View Price Cosworth Big Valve Cylinder Head Mitsubishi EVO X 08+ Cosworth Big Valve Cylinder Heads are manufactured from new OE castings and feature the latest in port shape and design engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a high performance...
	Cosworth Big Valve Cylinder Heads KK3766 Camshafts STD Crankshaft 9.2:1 CR Subaru EJ25 2.5L 04-06  Model Number: 20007705   View Price Cosworth Big Valve Cylinder Heads KK3766 Camshafts STD Crankshaft 9.2:1 CR Subaru EJ25 2.5L 04-06 After several years of testing and development, the Cosworth CS600 series High Performance Subaru EJ25 long block has arrived. The CS600 series is designed for extreme track day use and the demanding performance enthusiast. Each assembly is precision built by one of Cosworths skilled craftsmen using the finest components from their parts catalog to ensure maximum reliable power and performance. Star...
	Cosworth Big Valve Cylinder Heads KK3766 Camshafts STD Crankshaft 9.2:1 CR Subaru EJ25 2.5L 07  Model Number: 20007706   View Price Cosworth Big Valve Cylinder Heads KK3766 Camshafts STD Crankshaft 9.2:1 CR Subaru EJ25 2.5L 07 After several years of testing and development, the Cosworth CS600 series High Performance Subaru EJ25 long block has arrived. The CS600 series is designed for extreme track day use and the demanding performance enthusiast. Each assembly is precision built by one of Cosworths skilled craftsmen using the finest components from their parts catalog to ensure maximum reliable power and performance. Starti...
	Cosworth CNC Ported Big Valve Cylinder Head Ford Duratec 2.0L / 2.3L 01+  Model Number: 20000691   View Price Cosworth has been modifying Ford four cylinder engines since 1959 and the practice continues with the Ford Duratec/Mazda MZR. The Duratec/MZR was designed as a replacement for the Zetec engine and was developed as joint collaboration with Ford and Mazda. The lightweight engine features a cast aluminum reinforced block and main bearing girdle that help reduce vibration and improve overall rigidity.The Duratec is an excellent, affordable building block for high performance use and perfect for Lotu...
	Cosworth Big Valve Cylinder Head Assembly Mazda MZR 2.0L / 2.3L VVT 01-11  Model Number: 20000704   View Price Cosworth has been modifying Ford four cylinder engines since 1959 and the practice continues with the Ford Duratec/Mazda MZR. The Duratec/MZR was designed as a replacement for the Zetec engine and was developed as joint collaboration with Ford and Mazda. The lightweight engine features a cast aluminum reinforced block and main bearing girdle that help reduce vibration and improve overall rigidity.The Duratec is an excellent, affordable building block for high performance use and perfect for Lotu...
	Cosworth CNC Ported Big Valve Cylinder Head w/Cams Subaru WRX STI EJ25 08-12  Model Number: 20010140   View Price Cosworth Big Valve Cylinder heads for the Dual AVCS 2008 STI EJ257B engine. Machine Ported for maximum accuracy and performance, complete with larger (+1mm) valves and dual valve springs for maximum flow. Cosworth Big Valve Cylinder heads are the key to high power and unlocking the performance potential in your Subaru engine.These heads include Cosworth S2 version camshafts (20007935) with the correct cam followers included. This is the perfect head/camshaft combination for serious performance a...