Precise valve spring load is essential for stable high-RPM operation on the Nissan RB-series engines. The Tomei Valve Spring Seat Set (part number TA305A-NS05A) provides a 0.2 mm thickness option in a set of eight seats, allowing engine builders to fine-tune installed spring height and restore proper load after cylinder head work.
When a valve job is performed or aftermarket valve springs are installed, the effective spring height can change, reducing seat pressure below the intended specification. These precision seats are used to compensate for that variation, bringing spring load back into the correct range and helping prevent valve float, spring surge, or inconsistent valve control at elevated engine speeds. The 0.2 mm thickness offers a fine adjustment step for accurate setup on RB26, RB25, and RB20 cylinder heads.
At Terra Firma Automotive, we supply this genuine Tomei 0.2 mm Valve Spring Seat Set for builders working on Skyline and other RB-powered engines. Whether you are assembling a performance head with upgraded springs or restoring correct geometry after machining, these seats provide a simple and cost-effective way to achieve uniform spring loads. Choose Terra Firma Automotive for authentic Tomei components that support precise cylinder head assembly.
- Genuine Tomei Valve Spring Seat Set
- Part Number: TA305A-NS05A
- Thickness: 0.2 mm
- Quantity: 8 pieces
- Application: Nissan RB26 / RB25 / RB20 series
- Used to adjust valve spring installed height
- Helps restore correct spring load after machining
- Supports consistent valve control at high RPM
- Ideal for use with aftermarket valve springs
- Fine adjustment option for precision head work
- Prevents reduced seat pressure from valve jobs
- Simple and effective cylinder head setup tool
- Trusted Japanese performance component
- Available from Terra Firma Automotive
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