Product: STOPPER TYPE HEAD GASKET, Thickness (mm): 1, Compression Ratio: ε=11.7, Bore: D89.5, For supercharger engine, LH/RH each, opposed bead stopper type
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0.5mm, 0.7mm, and 1.0mm thick bore stopper type metal head gaskets are available for the FA20 engine of 86 & BRZ. This gasket provides higher bore sealing durability than stock.Use with HKS Capacity Upgrade Kit or Supercharger Kit provides the optimum performance.
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Features
＜POINT-1＞ Maintain high seal with high power!
All three types are durable against the high engine output. Stopper structure of the bore seal is designed to be a separated type to prevent leakage even under high gas-pressure at high engine output.
＜POINT-2＞ Contact surface pressure is improved!
Special coating was applied on the head and cylinder side to improve sealing performance when tightening the bolts.
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.)
t=0.7mm for Supercharged Engine
The t=0.7mm type utilizes a stopper taller than the t=0.5mm type to provide higher bore seal durability. With a stock pistons, the compression ratio is reduced only by 0.1; it allows to maintain high heat efficiency.
t=1.0mm for HKS Capacity Upgrade Kit + Supercharger
Installing the t=1.0 type gasket to a vehicle with the supercharger enables to adjust the compression ratio of Capacity Upgrade Kit; setting range can be widened.
Compression Ratio
| Piston | Gasket | thickness (mm) |
compression ratio |
| STOCK | STOCK | 0.6 | 12.5 |
| HKS | 0.5 | 12.6 | |
| HKS | 0.7 | 12.4 | |
| HKS ※2 | HKS | 0.5 | 12.4 |
| HKS | 0.7 | 12.1 | |
| HKS | 1.0 | 11.7 | |
| HKS ※3 | HKS | 0.5 | 11.1 |
| HKS | 0.7 | 10.9 | |
| HKS | 1.0 | 10.5 |
※These are design calculation ratios.
※2 FA2. 2.1L KIT (21004-AT002)
※3 FA20 2.1L KIT Low Comp (21004-AT003)