Cylinder Head Billet Half Moon Seal GoldFuji Racing Half Moon Seals Leak Free for the Long Haul Tired of oil leaks around your rocker covers? These Half Moon Seals are the fix that sticks. Found between the cylinder head and rocker cover on all EJ20 and EJ25 engines, factory half moon seals are prone to cracking and leaks over time especially when changing rocker cover gaskets. The Fuji Racing Half Moon Seals are CNC machined from T6061 billet alloy for a snug, secure fit. Unlike the