Ferrea Valvetrain & Roller Rocker Kit for 17-21 Civic Type-R

Ferrea Valvetrain & Roller Rocker Kit for 17-21 Civic Type-R

Ferrea Valvespring and Roller Rocker Valvetrain Kit for Honda K20C1 Turbo is a matched set of valvetrain components for the 2.0 liter DOHC VTEC K20C1 turbo engine used in the 2017 through 2021 Honda Civic Type R. In the K20C1 valvetrain, the valve springs and retainers control valve motion and keep the valvetrain stable as engine speed and boost related cylinder pressure increase, while the rocker arms transmit cam lobe motion to the valves. This kit combines a Ferrea single valve spring package with a Ferrea roller rocker set that is specified to work with the spring and retainer stack height and clearance requirements for this application.

This kit is typically selected when the factory spring and rocker configuration is no longer within the intended operating margin for an engine build that changes camshaft dynamics or increases the demands on valve control. The documented functional change in this package is the use of Ferrea single springs designed for the K20C1 turbo application and the required pairing with Ferrea roller rockers to address rocker arm and retainer clearance constraints that apply to this spring and retainer combination.

Key Features

• Application: K20C1 turbo engine
• Kit part number: KT4038
• Single valve springs: S10166 quantity 16
• Titanium retainers: E11142 quantity 16, 5.5 mm valve stem size, 7 degree lock angle, single spring configuration
• Valve locks: K10116 quantity 16
• Spring seat locators: SL1154 intake quantity 8, SL1153 exhaust quantity 8
• Roller rockers: RR1006 quantity 8

Compatibility and required pairing note: Ferrea specifies that valve spring set S10166 can only be used with Ferrea roller rockers RR1006 that come with this kit, due to rocker arm and retainer clearance requirements. For installers, this means the spring and retainer selection in this kit is not intended to be mixed with other rocker configurations for this K20C1 application.

Installation scope and considerations: Installation involves cylinder head valvetrain disassembly and reassembly with replacement of springs, retainers, locks, seat locators, and rocker arms. As with any valvetrain component change, verifying installed height and component clearances during assembly is part of the normal installation process for this category of parts. No noise, vibration, or harshness changes are specified by the manufacturer for this kit.