Bourne HPP Billet High Lift Cams for RSX/TSX/06-11 Civic Si

Bourne HPP 32R Billet VTEC Killer Race Camshafts - K20/K24 (RSX Type S, TSX, Civic Si)

This is the no-compromise version. The 32R Billet is the exact same aggressive race profile as our chill cast 32R, a VTEC killer grind so wild that the engine makes its best power on the big lobe full-time and the factory VTEC crossover stops meaning anything, but here it's machined from high-grade billet steel and super-finished to the highest standard. It's the all-out race specification, the same profile Bourne HPP runs in our own K22 Honda NSX time attack car, where it's proven itself in the harshest competition there is. This is a cam for fully built engines and serious programs, not a drop-in, and it demands a full supporting build to run.

Built for Extreme Output

The 32R profile uses aggressive lift and duration, opening the valves 14.50mm on the intake and 13.54mm on the exhaust, to unlock massive airflow at high RPM. The billet construction is what lets it do that at the very top of the power scale:

• Forced induction: the structural integrity of billet steel makes this the choice for high-boost builds, supporting up to 1,000 horsepower.
• Naturally aspirated: capable of pushing high-compression N/A engines to over 300 BHP.

The Billet and Super-Finish Advantage

This is what sets the 32R Billet apart from the cast version, and it comes down to the material and the finishing. Machining the cam from a solid billet blank gives it maximum tensile strength, which is exactly what you want when you're pushing serious boost and the valvetrain is under extreme load. Then the cam goes through a specialized super-finishing process that polishes it to a mirror-like surface. That isn't cosmetic. A smoother surface significantly reduces friction losses, so the valvetrain runs cooler, freer, and more efficiently. In endurance racing and high-boost applications, where heat is the enemy and every horsepower counts, that reduced friction is a real, measurable edge over a long stint.

Billet or Chill Cast?

Both 32R cams share the identical profile, so they make the same power on the same build. The difference is how hard you're pushing and for how long. If you're running high boost toward the top of the range or racing endurance events where heat and reliability over a long run decide the result, the billet steel's strength and the super-finish's lower friction earn their cost. If you're building a strong competition engine but not living at that extreme edge, the chill cast 32R gives you the same grind for less. This is the one you reach for when second best isn't an option.

This Is a Race Cam: What It Requires

Read this before you buy, because the 32R fundamentally changes how your engine breathes and it will not simply bolt in and run on a stock setup. Plan the full package:

• VCT delete (required): the profile is ground to run without the factory variable cam timing, so you must delete the VCT and install fixed cam gears.
• Uprated valve springs (essential): stock springs can't control the valves at this lift and RPM, and running them risks valve float and serious engine damage. Upgraded springs are non-negotiable.
• Standalone ECU tune (required): the factory ECU can't run this profile. A professional calibration on a standalone engine management system is required to make it run correctly and safely.
• Uprated fuel injectors (essential): the added airflow and power need more fuel than stock injectors can deliver, so larger injectors are a must.
• VTEC delete (recommended, not required): because this is a VTEC killer profile, the engine makes its power on the aggressive lobe full-time and the factory VTEC crossover no longer benefits you. Removing the VVT system and fitting VTEC lock pins locks the engine onto that lobe and suits the cam, though it isn't strictly required.

None of that is a knock on the cam, it's what a true race profile demands. If you're building a dedicated endurance, drag, or high-boost engine with standalone management, this is the top of the range. If you want real gains without a full race build, look at the Bourne HPP 21S drop-in cam, which adds power on a largely stock setup with none of these requirements.

Technical Specifications

• Intake duration / lift: 256 degrees / 14.50mm
• Exhaust duration / lift: 254 degrees / 13.54mm
• Valve clearance (intake / exhaust): .008" / .010"
• Usable RPM range: 1,500 - 9,000 rpm
• Material: billet steel (super finished)
• Part number: BHP-HK-32RB
• Best for: endurance racing and high-boost competition builds

Fitment

These cams are designed specifically for the K-series engines that run VTEC on both the intake and exhaust camshafts:

• 2002-2006 Acura RSX Type S (K20A2, K20Z1)
• 2004-2008 Acura TSX (K24A2)
• 2006-2011 Honda Civic Si (K20Z3)

They will also fit the K20A3, K24A1, K24A4, and K24A8. These engines use an i-VTEC design where VTEC acts on the intake cam only, so the 32R wasn't ground specifically for them and may need some additional supporting modifications to get the most out of it.