* Not released yet, set for release sometime 2007 *

Cosworth Big Valve Cylinder Head: Mazda MZR (2.0./2.3L)

For over 40 years, Cosworth has been the leader in innovative multi valve cylinder head design. The latest advancement is the Cosworth CNC Ported Big Valve Cylinder head range. Modified from OE cylinder head castings, substantial gas flow improvements and upgraded valve train components offer superior performance for your high performance engine.

Each original cylinder head design is carefully evaluated and tested to establish the improvements required to meet the target performance level. Hours of testing and flow bench validation are used to determine the best advanced port design yielding maximum usable power and response. However, there is more to cylinder design than just maximum flow. It is critical that port velocity is maintained to ensure drivability and valve train components are matched to guarantee reliable performance. Once all of these factors have been tested and validated, the final port contour is digitized. Using the digitized program, Cosworth then reshapes both intake and exhaust ports using a 5 axis CNC mill producing and accurate and consistent port shape every time. In addition to re-shaping and enlarging the intake and exhaust ports, most Big Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud the valves increasing air flow and performance. After machining, each cylinder head is ultrasonically, cleaned, serialized and then hand assembled with select high performance valve train components, ready to install on you engine.

Features include:

• Enlarged Intake and Exhaust ports.

• Large diameter stainless steel intake valves.

• Large diameter Inconel exhaust valves.

• Hi Rev valve springs.

• Titanium Retainers.

• Hardened Steel spring platforms.

• Reshaped combustion chamber on most applications.

• Flow bench proven design

• Dyno tested

• Machined Cosworth Logo

• Multi angle valve job

• Pre-assembled, ready to install