ARP 401-4701 B58 Engine Compatible Head Stud Kit - CA625+

ARP 401-4701 B58 Engine Compatible Head Stud Kit – CA625+

The ARP 401-4701 CA625+ cylinder head bolt set is an ultra‑durable head stud kit designed specifically for BMW’s high‑performance B58 engines. It delivers maximum head sealing where the factory studs fall short, especially on tuned engines running high boost pressure.

✅ Fully compatible with BMW B58 engines (F‑ and G‑chassis)

✅ CA625+ alloy: tensile strength up to 280,000 psi

✅ Outstanding resistance to high heat and pressure

✅ Ideal for turbocharged and racing applications

✅ Includes ARP assembly lube and detailed installation instructions

Where OEM bolts can stretch under high cylinder pressures, ARP CA625+ studs eliminate that risk. They keep the head clamped tight and stable to the block, preventing gasket failures or boost leaks.

Compatible Vehicles

- BMW M140i / M240i (F20‑F22)

- BMW 340i / 440i (F30‑F32)

- BMW G20 340i / G22 440i (B58‑powered models)

- Toyota GR Supra A90 / A91 (3.0 B58 engine)

Installation

Installs directly in place of the OEM bolts. Use a professional torque wrench and follow the manufacturer’s torque values and sequence. Proper gasket and surface preparation are recommended.

Note

Only compatible with vehicles with the B58 engine code. Before installation, carefully follow the correct torque and lubrication procedures.