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For over 40 years; Cosworth's been leader in innovative multi valve cylinder head design both racing high performance production cars. Cosworth Ported Valve Cylinder head range is latest advancement. Modified from OE cylinder head castings; substantial flow improvements upgraded valve train components offer superior performance your high performance engine.
Each original cylinder head design is carefully evaluated tested to establish improvements required to meet target performance level. Hours of testing flow bench validation used to determine best advanced port design yielding maximum usable power response. However; there is more to cylinder head design than just maximum flow. It is critical that port velocits maintained to ensure drivability valve train components matched to guarantee reliable performance. Once of these factors have been tested validated; final port contour is digitized. Using digitized program; we then reshape both intake exhaust ports using axis mill producing an accurate consistent port shape every time. In addition to reshaping enlarging intake exhaust ports; most Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud valves increasing flow performance. After machining; each cylinder head receives a multiangle high performance valve on precision valve seat cutter. Then each cylinder head is ultrasonically; cleaned; serialized then hand assembled with select high performance valve train components; ready to install on your engine.
Key Features
All OE Castings
Enlarged Intake Exhaust ports
Large diameter stainless steel intake valves
Large diameter Inconel exhaust valves
Hi Rev; Dual valve springs
Titanium Retainers
Hardened Steel spring platforms
Reshaped combustion chamber on most applications
Flow bench proven design
Dyno tested
Machined Cosworth Logo
Precision Multi angle valve job
Pre-assembled; ready to install
Machined port bore finish
Knife edge port divider Learn More

Brian Crower Valves are made from premium stainless steel; fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. Learn More

Brian Crower Valves are made from premium stainless steel; fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. Learn More

Brian Crower Valves are made from premium stainless steel; fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. Learn More

Brian Crower Valves are made from premium stainless steel; fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. Learn More

The double-adjustable shock allows external adjustment of both rebound and compression. In addition to the same precise and accurate rebound adjustment mechanism in the single-adjustable, the double-adjustable shock has a remote reservoir with the compression adjuster and gas volume. This reservoir is connected to the shock with a Teflon-lined high-pressure hose and uses a 22mm piston rod. The double-adjustable allows you to refine the handling of your car by adjusting both the rebound on the shock rod and the compression blow-off valve in the remote reservoir. Ideal for racing where the rules prohibit more than 2-way adjustment
Features:

• Includes spherical upper mounts (with camber adjustment where applicable)
• Includes helper springs
• Includes main springs, with non-standard rates available
• Very sensitive and responsive adjustment mechanisms
• Large piston rod provides maximum oil flow on small movements
• Light weight and high strength
• Good heat dissipation
• Ride height adjustable
• Outstanding repeatability Learn More

JRZ Suspension is proud to offer our Triple Adjustable racing damper. Advancing the design of our Double Adjustable further. the JRZ Triple Adjustable utilizes the same piston design while adding function to the Triple Adjustable canister. Like the Double Adjustable. the Triple Adjustable has a wide adjustment range with precise. even adjustments engineered to enable the chassis tuner to make significant. predictable changes every time.

Compression adjustments are separated into the high speed and low speed piston velocity ranges. This level of adjustment creates an environment for precise tuning. The mono tube Triple Adjustable Damper offers a wide adjustment range allowing the user to tailor the damper to driver. track and vehicle. The JRZ Triple Adjustable Damper is available as a complete kit with springs and mounting hardware. Custom applications are available.

An easy to use system. the Triple Adjustable Damper enables the chassis tuner to achieve the desired mass control and handling with precision.  Digressive high speed compression blow off adjustment allows for a stiff compression valving while maintaining smooth response and without losing traction. The low speed adjustment is a powerful tool that enables the chassis tuner to maximize grip and optimize vehicle balance. The result is a damper that provides ultimate chassis and ride height control with maximum mechanical traction.
The JRZ standard large 22mm piston rod works in concert with the high speed valving to maximize blow off valve response. achieving solid chassis control without using a high spring rate. JRZ Triple Adjustable dampers are shipped with 360 degree swivel hoses and are available with zero-inclusion quick disconnects for mounting canisters within the chassis for ease of adjustment accessibility. Our proven piston has been developed to deliver a smooth and responsive damping characteristic. To customize track to tracks setups and tailor the chassis to the driver; the JRZ Triple Adjustable Damper has an adjustment range able to provide damping to spring configurations ranging from 1.5-6Hz on vehicles with moderate to large aerodynamic loads. Even with a large range. each adjustment is designed to be a small. even step giving precision and confidence when making changes.

Features

• Large adjustment range
• 6 clicks low speed compression
• 14 clicks high speed compression
• 24 clicks rebound
• High response piston
• Precise canister
• Adjustable gas pressure

The JRZ Triple Adjustable takes you to the next level. Dedicated racing cars with experienced drivers deserve the professional technology JRZ delivers. Valving designed and innovated by JRZ Suspension Engineering. the JRZ Triple Adjustable is shipped as a custom configuration always tailored to the customer’s needs. and always comes with our world renowned personal service.

Benefits

• Precise control of the chassis and unsprung masses
• Excellent tyre wear 
• Easy to change configurations

Recommended applications

• Professional racing mandating 3 way adjustment
• Experienced club racing

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JRZ Suspension Engineering offers the best high performance club sport damper available today. Combining the best aspects of our JRZ RS and 2-way racing damper. the JRZ RS Pro gives the owner ultimate suspension tuning ability while maintaining compliance for driving on public roads. A mono tube double adjustable damper with adjustable gas pressure. the JRZ RS Pro offers an increased adjustment range allowing the user to tune the car to their further needs. The JRZ RS Pro is available as a complete kit with springs and mounting hardware. Taking club sport performance to the next level. the RS Pro has a remote canister with a digressive blow off system. Digressive blow off allows for a stiff compression valving while maintaining smooth response. The result is a damper that provides ultra solid platform with smooth bump compliance. JRZ standard 22mm piston rods maximize flow to the blow off valve response to great chassis control without using a high spring rate.

Features
• 22 mm rod strut. 16 mm rod damper
• 12 clicks of compression
• 24 clicks of rebound
• Adjustable gas pressure. mono tube
• Piston designed for high performance
• Large adjustment range
• Fixed hoses for easy mounting. available quick disconnect fittings
• Remote reservoir or piggyback canister 
JRZ RS Pro damper kits are available in piggyback configurations or with remote canisters. The canister can be fixed to the damper for ease of installation. To customize track to track setups and tailor the chassis to the JRZ RS Pro has an extra large adjustment range.
Each adjustment is designed to be an even step giving you predictability when making changes. The design of the JRZ RS Pro takes you to the next level. Stiffer cars with higher levels of power demand the control JRZ can supply. With the control of gas pressure charge as well and compression and rebound adjustments. the JRZ RS Pro will get the most out of your high performance car. The JRZ RS Pro is shipped as a bolt on kit with installation instructions and always comes with our world renowned personal service of JRZ.

Benefits
• Better chassis control for higher rate springs/power/ratio
• Street ride. racing performance
• Easy to change configurations

Recommended applications 
• Highly modified Street/DE
• Experienced club racing
• Entry level professional racing Learn More

The JRZ damper is an advanced development in high performance shock absorbers. The JRZ RS is a high gas pressure double adjustable twin tube damper. without the use of an external reservoir. Applying our race winning technology. JRZ designed the JRZ RS to give precise chassis control when driving on track and ultimate comfort for daily driving. Easy to install. the JRZ RS is available as a complete kit with mounting hardware and springs for all applications we support.  Following JRZ’s design philosophy. the JRZ RS has a large 22 mm diameter piston rod in strut applications and a 16 mm in aluminium damper applications. This means responsive chassis control at even the smallest suspension movements.  The large piston rod in combination with the high nitrogen gas pressure creates a lifting force giving great chassis control without using a high spring rate.  Our twin tube design uses a smaller diameter piston that gives a smooth feel during street driving. Working in conjunction with our blow off compression valving patterned from our racing dampers. the JRZ RS valving is the perfect marriage between daily driving and club racing.  To work with all ranges of spring and driver needs. the JRZ RS has an extra large adjustment range. With a few clicks you can turn your smooth street car into a crisp. rock solid track car in seconds.

Features

• 22mm piston rod
• Pre-set high gas pressure
• Piston developed for street and track
• Double adjustable
• 14 clicks compression
• 24 clicks rebound
• No canister
• Large adjustment range

These features culminate in the ultimate street and track damper. The JRZ RS is shipped as a bolt on kit with installation instructions and always comes with the personal service JRZ is known for.  Using the best materials. coatings and aerospace standard manufacturing processes; the JRZ RS is designed for long life. Unlike many clubsport dampers. the JRZ RS can be run for thousands of miles with no loss of performance or leakage.  Adjustment is easy to perform and comes with the knowledge basis only JRZ provides to its customers.

Benefits

• Easy installation
• Street ride. racing performance
• Long service life
• Applications available for prepared and stock class racing

Recommended applications

• Street/DE
• Club racing
• Prepared class racing

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