Maintaining correct valve spring installed height and load is important for reliable valvetrain operation, especially after cylinder head work. The Tomei Valve Spring Seat Set (part number TA305A-NS05B) provides 0.3 mm seats designed for Nissan RB26, RB25, and RB20 engines, offering a simple way to restore or fine-tune spring preload when the installed height has changed.
Machining operations such as a multi-angle valve job can reduce the distance between the spring seat and retainer, lowering installed spring load below the intended specification. These 0.3 mm seats help bring the spring load back toward the proper range, supporting more consistent valvetrain control and reducing the risk of spring surge or related issues at higher RPM. The set includes eight seats, making it suitable for a complete bank or as needed during head assembly.
This is a practical supporting component for performance or refreshed cylinder heads on RB-series engines where spring height and load need correction. At Terra Firma Automotive, we supply this genuine Tomei Valve Spring Seat Set as a useful adjustment tool for RB26, RB25, and RB20 builds. Whether you are assembling a modified head or correcting load after machining, these seats provide a straightforward solution from Tomei. Choose Terra Firma Automotive for authentic Japanese valvetrain components that support proper spring setup.
- Genuine Tomei Valve Spring Seat Set
- Part Number: TA305A-NS05B
- Thickness: 0.3 mm
- Application: Nissan RB26, RB25, and RB20
- 8-piece set
- Helps restore or adjust installed spring height
- Useful after valve jobs that reduce spring load
- Supports correct spring preload
- Helps reduce risk of spring surge at higher RPM
- Practical during performance or refreshed head assembly
- Simple and effective valvetrain adjustment component
- Compatible with common RB-series spring setups
- Trusted Japanese valvetrain engineering
- Available from Terra Firma Automotive
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