When an RB26DETT has been bored beyond the standard 86–87 mm range, a corresponding oversize head gasket becomes essential. The Tomei Cylinder Head Gasket (part number TA4070-NS05E) is a multi-layer metal gasket designed for the RB26 engine with an 88.0 mm bore and 1.5 mm thickness. This combination is commonly selected for engines that have been overbored for increased displacement or to clean up cylinder walls during a rebuild.
Factory gaskets are not intended for oversize bores, and using an incorrect size can compromise sealing. Tomei’s 88.0 mm design incorporates reinforced sealing around the larger combustion chambers together with carefully engineered water and oil passages, providing the strength needed to handle elevated cylinder pressures and temperatures. The 1.5 mm thickness offers a balanced option for compression ratio control, making it suitable for a wide range of forced-induction setups.
At Terra Firma Automotive, we supply this genuine Tomei 88.0-1.5 mm head gasket for Skyline GT-R R32, R33, and R34 owners running overbored RB26 engines. Whether you are completing a high-performance rebuild or refreshing a previously machined block, this gasket delivers the precise fitment and durability expected from Tomei’s Japanese engineering. Choose Terra Firma Automotive for authentic components that support reliable sealing on oversize RB26 applications.
- Genuine Tomei Cylinder Head Gasket
- Part Number: TA4070-NS05E
- Application: Nissan RB26DETT (oversize bore)
- Bore size: 88.0 mm
- Thickness: 1.5 mm
- Multi-layer metal construction
- Reinforced combustion chamber sealing
- Precision water and oil passage design
- Designed for overbored RB26 engines
- Suitable for street and high-boost builds
- Allows compression ratio adjustment
- Improved resistance to heat and cylinder pressure
- Direct fit for R32 / R33 / R34 GT-R
- Stronger alternative to factory head gaskets
- Trusted Japanese performance component
- Available from Terra Firma Automotive
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