Honda K20 K24 Street Drop in Cam - Bourne HPP

Maximize Your K-Series Potential Without the Complexity

The Bourne HPP 21S Drop-In Camshaft (BHP-HK-21S) is the ultimate upgrade for Honda K-Series enthusiasts seeking measurable performance gains without the cost or hassle of a full cylinder head build. Designed by engineers with real-world motorsport experience, this camshaft bridges the gap between stock reliability and race-winning performance.

True Drop-In Convenience

Unlike aggressive race profiles that require expensive supporting mods, the 21S is designed to operate safely with your factory setup.

• No cylinder head machining required.

• Compatible with standard valve springs.

• Works with OEM valvetrain components.

Dyno-Proven Results

Don't just chase peak numbers - chase usable power. Independent testing against leading competitor profiles has demonstrated proven results up to and over 260BHP, depending on your supporting modifications and intake setup.

Crucially, the 21S isn’t just about top-end power. It is engineered to deliver superior mid-range torque compared to OEM JDM cams and other drop-in options. This ensures that while you achieve high peak horsepower, you also gain significant acceleration out of corners and a wider power band.

Built to Last: Chill Cast Construction

Reliability is just as important as performance. Bourne HPP camshafts are manufactured from high-quality chill cast iron blanks, the industry standard for durability. This process ensures exceptional surface hardness and resistance to wear, preventing lobe pitting and degradation over time. Whether you are commuting or redlining on the track, you can trust these cams to withstand the rigours of high-performance driving.

On the Road & Track

Whether you are building a regulated race car or a fast road daily, the 21S delivers smooth, predictable power delivery. You maintain a stable idle and excellent cold-start behaviour while gaining a significant edge in throttle response and torque across the rev range.

Recommended Extras: Bourne HPP Valve Springs, Bourne HPP Valves

Technical Specifications:

• Intake Duration / Lift: 260° / 13.46mm
  
  
• Exhaust Duration / Lift: 252° / 12.19mm
  
  
• Valve Clearance (Intake / Exhaust): .008” / .012”
  
  
• RPM Range: 1,500 - 9,000 rpm
  
  
• HP Gains: 20 - 30 HP
  
  
• Torque Gains: 15 - 20 lb-ft
  
  
• Material: Chill Cast Iron
  
  
• Engine Fitment: Honda K20 / K24
  
  
• Part Number: BHP-HK-21S
  
• Best For: Street / Fast Road