New product announcement from HKS… Stopper Type Head Gasket for Scion FR-S and Subaru BRZ is underway.
Two gaskets will be offered for the FA20 engine:
NA 12.6:1 Compression Ratio, 0.5mm thickness, 89.5mm bore, opposed bead type – 300HP capable (PN 23001-AT002)
BOOST 12.4:1 Compression Ratio, 0.7mm thickness, 89.5 bore, opposed bead type – 600HP capable (PN 23001-AT003)
Opposed Bead Stopper Type Metal Gasket for the FA20 engine of 86/BRZ provides higher bore sealing durability than a stock gasket. Both types are endurable against high engine output. Stopper structure of the bore seal prevents leakage even under high cylinder pressure at high engine output. Boosted gaskets compression is kept high to maintain high efficiency. Contact surface pressure is improved via a special coating applied to the head side and cylinder side to improve sealing performance when tightening the bolts.