ARP BMW B58 CA625+ Head Stud Kit - M240i/M340i/M440i
ARP BMW B58 CA625+ Head Stud Kit - M240i/M340i/M440i
The ARP CA625+ Head Stud Kit (Part #203-4706) for the Supra/M240/340/440 B58 engine is a high-performance upgrade featuring ARP's advanced CA625+ alloy, offering superior tensile strength (around 260 ksi) and corrosion resistance to prevent head gasket failure under high boost, ensuring reliable performance for heavily modified engines by providing consistent clamping force where factory bolts fail.
Key Features:
· Material: Made from ARP's proprietary CA625+ super alloy, offering exceptional strength and toughness.
· Performance: Provides significantly higher clamping force than factory bolts, crucial for high-horsepower builds and preventing cylinder head lift.
· Durability: Highly resistant to corrosion and oxidation, ensuring long-term reliability.
· Application: B58 engines in Supra/M240/340/440 B58 Gen2
Confirmed catalogue fitment
- Engine families: B58
- BMW chassis: G42, 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
- Vehicle models: M240i
- Production years: 2013-2026
- Drivetrain: RWD, AWD
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.
Chassis: G42, 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
Engines: B58
Drivetrain: RWD, AWD
Production years: 2013-2026
View compatible BMW ranges
M240i
View full year and variant fitment
PROFESSIONAL FITTING AVAILABLE
Need M Lab by Boost & Tune to install this?
Have this part professionally fitted, checked and configured by our BMW performance workshop.
Product: ARP BMW B58 CA625+ Head Stud Kit - M240i/M340i/M440i
Workshop installation in Albion, Victoria
Vehicle compatibility
Fits these BMW platforms
Select a BMW in My Garage to check this product.
Use the BMW vehicle selector and confirm VIN, model year, drivetrain, steering side and factory options before ordering.
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