Kelford KVS58-BTX Extreme Racing Valve Springs – BMW B58 / S58

Kelford KVS58-BTX Extreme Racing Valve Spring Kit for BMW B58 and S58 3.0L inline-six engines.

This high-energy valvetrain package uses progressively wound PACALOY beehive springs with titanium retainers and precision-machined spring seats for high-boost, high-RPM engine combinations.

• Designed for BMW B58 and S58 3.0L engines
• Extreme-racing specification for high boost and high horsepower
• PACALOY beehive spring construction
• Titanium retainers
• Designed to complement Kelford Stage 2 and Stage 3 camshaft combinations

Professional engine assembly and installed-height verification are required. Confirm the latest Kelford setup specifications for the camshaft, cylinder head and intended RPM range before installation.

Confirmed catalogue fitment

• Engine families: B58, S58
• BMW chassis: F20, F21, F22, F23, F30, F31, F32, F33, F34, F36, G01, G02, G05, G06, G07, G11, G12, G14, G15, G16, G20, G21, G22, G23, G26, G29, G30, G31, G32, G42, G43, F97, F98, G80, G81, G82, G83, G87

Engine build and installation guidance

Engine hardware must be matched to the exact engine version, machining specification, intended power level and complete rotating or valvetrain combination. Final clearances, fastener preparation, torque procedures, piston-to-valve clearance and calibration requirements remain the responsibility of the engine builder.

Do not order from the engine-family label alone. Confirm the supplier part number, required machining, included components and compatibility with the remaining short-block, cylinder-head and induction hardware.

Before ordering

Select your exact BMW through MLAB My Garage and review the product options, included parts and installation requirements. Where a vehicle has been modified from its original engine, transmission or fuel-system specification, contact MLAB with the VIN and current hardware list so the combination can be checked before supply.

MLAB support

MLAB by Boost and Tune can assist with product selection, workshop installation and dyno calibration for supported BMW applications in Melbourne. Product availability and lead time should be confirmed when ordering supplier-built or special-order components.