Skunk2 305-05-9100 Ultra Stage 1 Camshafts for K20C1 Civic Type R 17-21

Vehicle Fitment

• 2017-2021 Honda Civic Type R (FK8), K20C1 Engine
• Also applicable to other K20C1-equipped chassis codes (FK2/FL5), where the same engine is used - confirm your specific model and market before ordering

Fitment Notes

• True drop-in camshaft - compatible with the factory stock valve springs, no valve spring upgrade required for this Stage 1 cam
• Retains stock idling characteristics - no lumpy or rough idle typical of more aggressive performance camshafts
• For further power gains beyond this Stage 1 cam, Skunk2's Ultra Stage 2 camshaft is available separately but requires upgraded valve springs

Features

• Machined from forged 8660 alloy steel blanks for superior strength and durability under sustained high-RPM use
• Induction hardened and CNC precision ground for tight tolerances and long-term wear resistance
• Ultra lobe profiles designed in-house using advanced simulation and CAD modeling techniques
• Performance rigorously validated on the dynamometer, not just simulated
• Delivers 25-40+ bhp gains throughout the powerband, up to 8000 RPM
• Drop-in installation (DIC) simplifies the upgrade compared to camshafts requiring supporting valvetrain modifications

Specifications

• Part Number: 305-05-9100
• Brand: Skunk2 Racing
• Product Line: Ultra Series Camshafts
• Stage: Stage 1
• Engine Application: Honda K20C1
• Material: Forged 8660 Alloy Steel
• Intake Camshaft Primary Lift: 10.4mm (0.410 in.)
• Intake Camshaft Duration: 228° @ 1mm
• Exhaust Camshaft Primary Lift: 9.2mm (0.365 in.)
• Exhaust Camshaft Primary Duration: 202° @ 1mm
• Exhaust Camshaft Secondary Lift: 10.7mm (0.422 in.)
• Exhaust Camshaft Secondary Duration: 233° @ 1mm
• Valve Spring Requirement: Stock (no upgrade required)
• Estimated Power Gain: 25-40+ bhp

Included Components

• 1x Intake Camshaft
• 1x Exhaust Camshaft

Product Description

The Skunk2 305-05-9100 Ultra Stage 1 Camshafts are built specifically to unlock more of the K20C1 engine's potential in the 2017-2021 Honda Civic Type R, designed as a genuine drop-in performance upgrade that doesn't require swapping valve springs to run. Machined from forged 8660 alloy steel and both induction hardened and CNC precision ground, these camshafts are engineered for the durability and tight tolerances that sustained high-RPM performance driving demands.

Skunk2 designed the Ultra lobe profiles in-house using advanced simulation and CAD modeling, then validated the real-world results on the dynamometer rather than relying on simulation data alone. The intake camshaft delivers 10.4mm of primary lift across 228° of duration, while the exhaust camshaft runs a dual-lobe design with 9.2mm primary lift (202° duration) and 10.7mm secondary lift (233° duration) - a setup that works with the Civic Type R's VTEC system to deliver meaningful gains without sacrificing streetability.

Because this Stage 1 camshaft is compatible with the factory stock valve springs, it retains the Type R's stock idling characteristics while still adding 25-40+ bhp throughout the powerband, up to 8000 RPM. Drivers looking for more aggressive gains beyond this Stage 1 setup can step up to Skunk2's Ultra Stage 2 camshaft, though that higher-lift cam does require upgraded valve springs to run safely.