Mugen metal head gaskets are designed and configured in conjunction with the valve springs and ECU. Their thickness has been reduced to 0.47 from the normal 0.7 of Type-R/B18C engines, and the compression ratio has been increased from 11.1 to 11.4. Two-layer construction is used instead of the usual three layer gasket. Laser welded to prevent blowout at high compression.
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