The durability of the bore seal of this gasket t=0.5mm for NA engine is improved, and the compression ratio increase compared with the stock that makes this gasket ideal for one-make race. (This gasket can be installed to a supercharged engine.)
Compression Ratio
Stock Thickness: t=0.6mm (ε12.5) HKS Thickness: t=0.5mm (ε12.6)
Both types are endurable against high engine output. Stopper structure of the bore seal is separated type so it prevents leakage even under high gas-pressure at high engine output.
Special coating was applied on the head side and cylinder side to improve sealing performance when tightening the bolts.
(Contact Surface Pressure Measurement)
(Structure Comparison)
NA t=0.5
* Comperd to stcok, bore seal is independent and has higher seal surface pressure,
therefore same amount of stopper, bore seal is stronger.
* Thinner than stock and compression ratio is 0.1 higher
Supercharger t=0.7
* Comperd to stcok, bore seal is independent and has higher seal surface pressure,
therefore bore seal power is much stronger.
* Thicker than stock and compression ratio is 0.1 less than stock
Stock t=0.5
* Bore stopper is similar to the other seal and ther surface pressure polymerize,
it has lower seal ability than the independent type
This website does not show live stock.
If the product is in stock we ship same/next day.
If a product needs to be ordered in the typical wait time is 1-2 weeks. This means the product is special ordered.
Shipping times vary depending if the part is in stock at our warehouse and which shipping option is chosen at checkout.
Please contact us for an accurate ETA and availability.
