HKS 0.5mm Thick Opposed Bead Stopper Type Metal Head Gasket 2013-2021 BRZ / 2013-2016 FRS / 2017-2021 86
Here, you are looking at the HKS Opposed Bead Stopper Type Metal Gasket 2013-2021 BRZ/FRS/86.
With t=0.5mm gasket, NA engine's compression ratio increases compared with the stock! 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)
Maintain a high seal with high pressure!
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.
Contact surface pressure is improved!
Special coating was applied on the head side and cylinder side to improve sealing performance when tightening the bolts.
Bore seal pressure was confirmed in figures. (See the diagram below.)