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From previous experience, we knew we would need a killer breather system for the Laguna's 560hp solid-roller small-block. We found the perfect breathers from Moroso. These spun aluminum pieces clamp to the valve covers with a large locking nut. The top unscrews for the oil fill, and is sealed to the bottom half with an O-ring. A screen and a sponge inside the breather separate the oil from the crankcase vapor, and a vent carries the vapors to the 1-quart breather tank on the firewall. We used -10 AN fittings with Russell Twist-Lok hose ends and hose.