Moroso GM BBC -12AN Breather 3.875in Tall Aluminum Valve Cover - Pair

If you're building a high-performance big block Chevy engine, getting the crankcase ventilation right is key to its longevity and power. These Moroso aluminum valve covers are designed specifically for GM BBC applications and come with integrated -12AN breather fittings, making it easier to set up a proper PCV or evacuation system. They stand 3.875 inches tall, giving you ample clearance for most valvetrain components, including roller rockers.

Crafted from durable aluminum, these valve covers are lighter than stock steel ones and offer a solid foundation for your engine build. The pair includes the necessary -12AN fittings, which are a popular choice for high-flow breather setups. This design helps manage crankcase pressure, preventing oil leaks and improving overall engine efficiency. The tall profile ensures that even modified valvetrains have plenty of room to operate without interference.

When installing these, ensure you have a good quality valve cover gasket that matches the dimensions of your BBC heads. Proper sealing is crucial to prevent oil leaks and maintain engine cleanliness. These valve covers are a well-built component for serious engine builds where performance and reliability are top priorities.