Kelford Cams for B58 and S58 Engines: Precision from New Zealand

Kelford Cams for B58 and S58 Engines: Precision from New Zealand

When it comes to extracting every bit of performance from BMW’s modern inline-six powerplants, camshaft choice is critical. Whether you’re building a high-horsepower street car, a dedicated track machine, or a record-chasing drag setup, pairing the right cams with professional cylinder head work can be the difference between good results and great results.

At 5150 AutoSport, we proudly offer Kelford Camshafts for the BMW / Toyota B58 and BMW S58 engines—and when combined with our Performance Cylinder Head Services, the gains speak for themselves.

The Kelford Story: Performance Engineering from New Zealand

Kelford Cams began in Christchurch, New Zealand, in 1968 as a small camshaft regrinding workshop. Over the decades, they’ve grown into one of the most respected names in high-performance camshaft manufacturing, supplying top-tier racers and engine builders worldwide.

Their heritage is built on precision machining, advanced design software, and rigorous quality control. Today, every Kelford camshaft is crafted in New Zealand from high-grade blanks, ensuring consistency and durability, even in extreme motorsport environments. Kelford’s reputation isn’t marketing fluff—it’s backed by championship-winning performance across drag racing, circuit racing, drifting, and time attack competition.

Why the B58 & S58 Deserve Performance Cams

BMW’s B58 and S58 engines are already exceptional from the factory.

  • The B58, introduced in 2015, is a robust turbocharged inline-six that responds incredibly well to tuning and bolt-on modifications.
  • The S58, its high-performance twin-turbo evolution, features forged internals, improved cooling, and a higher rev ceiling—designed to handle serious power output.

But even with these strong foundations, factory cam profiles are a compromise between performance, emissions, and everyday drivability.

Performance camshafts—like those from Kelford—change the game by:

  • Increasing valve lift and duration, allowing more air and fuel into the combustion chamber.
  • Optimizing valve timing to match higher boost levels and increased airflow from upgraded turbos.
  • Shifting the power band for stronger mid-range pull or higher-RPM peak power, depending on your build goals.

Pairing Kelford Cams with Our Performance Cylinder Head Services

A camshaft upgrade works best when the rest of the valvetrain and cylinder head can support it. That’s where 5150 AutoSport comes in.

Our B58 and S58 Performance Cylinder Head Service includes:

  • CNC porting for maximized airflow and perfectly matched ports.
  • Precision trueness checking & resurfacing to ensure sealing integrity.
  • Multi-angle CNC valve jobs for improved airflow around the valves.
  • Valve unshrouding to further enhance combustion efficiency.
  • Balanced high-performance valvetrain components to handle aggressive lift and duration profiles.

Pairing Kelford cams with our cylinder head services ensures every cylinder flows evenly, valve events are fully optimized, and your engine can take full advantage of the upgraded cam profiles.

Build Paths with Kelford Cams

Kelford offers multiple cam stages for the B58 and S58 platforms, tailored to your target horsepower and intended use:

  • Stage 1 – Ideal for 600–850 hp street/track cars. Maintains drivability with noticeable top-end gains.
  • Stage 2 – Suited for 850–1,200 hp builds. Stronger mid-range punch and top-end power, requires upgraded valve springs.
  • Stage 3 – Designed for extreme drag or half-mile racing, supporting 1,400 hp+. Maximum airflow and high-RPM capability.

No matter the stage, pairing the cams with head work ensures that you’re not leaving airflow—and horsepower—on the table.

Ready to Take Your B58 or S58 Further?

Upgrading to Kelford Cams is one of the most effective ways to unlock the full potential of BMW’s latest inline-six engines. When matched with our precision cylinder head services, you’re building an engine that breathes better, revs harder, and produces the kind of power that gets noticed—on the dyno, at the track, or on the street.

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