Maintain a high seal with high pressure!
Stopper structure of the bore seal is separated type so it prevents leakage even under high gas-pressure at high engine output.
600ps D1 spec is reproduced for a supercharged engine!
The t0.7 type (for an engine equipped with a large Supercharger) utilizes a stopper higher than the stock gasket to provide higher bore seal durability. It is designed to be endurable against 600ps engine power. Compression ratio was reduced only t0.7 so high heat efficiency can be maintained. Compression ratio of the gasket for a supercharged engine is 12.4. Its thickness is t0.7. (Stock compression ratio is 12.5 and thickness is t0.6.)
Contact surface pressure is improved!
Special coating was applied on the head side and cylinder side to improve sealing performance when tightening the bolts.