Brian Crower BC0326 Beehive Spring Ti Retainer Kit for BMW/Toyota B58 Engine

Vehicle Fitment

• 2020+ Toyota GR Supra, B58 3.0L Turbo I6
• BMW B58-equipped models (e.g., 340i, 440i, M240i, X3 M40i, Z4 M40i) - confirm exact model/year with Brian Crower

Fitment Notes

• Engine-specific kit (B58 3.0L turbo inline-6) - spans multiple BMW chassis and the Toyota GR Supra that share this engine
• Confirm your exact vehicle application with Brian Crower before ordering

Features

• Beehive spring design reduces reciprocating mass for high-RPM stability
• Wound from high-grade, super clean chrome silicone alloy
• Proprietary processing procedures ensure consistent spring pressure
• Titanium retainers CNC machined from 6AL4V round bar to exacting tolerances
• Designed to handle increased lift from aftermarket camshafts
• Reduces valvetrain weight versus factory steel retainers
• Supports sustained high-RPM operation without spring surge
• Manufactured to Brian Crower's precision quality standards

Specifications

• Spring type: Beehive (progressive rate)
• Retainer material: 6AL4V titanium, CNC machined
• Seat pressure: 80 lbs @ 1.450"
• Open pressure: 180 lbs @ 0.950"
• Coil bind: 0.910"
• Maximum lift: 0.480"

Included Components

• Beehive valve springs and titanium retainers (full engine set)

Product Description

The Brian Crower BC0326 is a beehive valve spring and titanium retainer kit built for the B58 3.0L turbocharged inline-6, shared across the Toyota GR Supra and multiple BMW models. Wound from high-grade chrome silicone alloy by PAC Racing Springs, the beehive design reduces reciprocating mass for stable high-RPM performance, while CNC-machined 6AL4V titanium retainers shave further weight from the valvetrain.

Together, they're built to support increased lift from aftermarket camshafts and sustained high-RPM operation without spring surge or valve float. Since the B58 engine spans many BMW chassis codes, confirm your exact vehicle application with Brian Crower before ordering.