Valve Covers, Breathers, Oil Fill Caps

Finishing the Top End: Valve Covers, Breathers, and Oil Fill Caps at Butler Performance

1. Valve Covers: Function Meets Finish

The valve cover must do two jobs: look great and provide necessary clearance for the valvetrain. Butler Performance offers solutions for both.

Butler Custom Valve Covers

These are the signature dress-up components offered by Butler, often featuring unique branding and construction:

• Billet Aluminum: Many high-end covers are precision CNC-machined from billet aluminum. These offer unmatched rigidity, which helps maintain a perfect seal, and feature a stunning, high-quality finish (often polished or black anodized).

   

• Clearance for Valvetrain: Modern hydraulic roller cams often require stud girdles or taller rocker arms, which can interfere with stock valve covers. Butler’s performance valve covers are designed with extra height and internal clearance to accommodate these components.

• Specialized Designs: Including covers with integrated coil mounts for a cleaner ignition wiring look, and designs specific to traditional Pontiac blocks.

Stock and Aftermarket Valve Covers

For builders seeking a more traditional appearance, Butler also stocks quality aftermarket covers:

• Stamped Steel: Classic chrome or painted stamped steel covers are available for a period-correct look.

• Cast Aluminum: Covers that mimic the look of classic factory aluminum covers but with stronger castings and better sealing surfaces.

2. Breathers and Grommets: Ventilation and Sealing

The engine crankcase needs to breathe to relieve pressure and moisture, a function handled by the breather and PCV (Positive Crankcase Ventilation) system.

• Breathers—Butler CNC Logo: These custom breathers are machined with the Butler Performance logo, providing a high-quality aluminum finish that matches the valve covers. They typically feature a porous element to filter the air entering or exiting the crankcase.

• Breathers—Stock and Aftermarket: Offering various styles, including polished, chromed, or color-anodized units from brands like Moroso or Mr. Gasket.

   

• Grommets: Crucial small parts that provide a secure, oil-tight seal where the breather or PCV valve enters the valve cover. Butler stocks high-temp rubber grommets in various sizes to ensure a perfect fit.

3. Oil Fill Caps and Baffles

The oil fill point must be sealed securely, especially with oil splashing inside the cover.

• Oil Fill Caps: Available in standard twist-on styles and high-end billet caps that offer a show-quality look and secure seal.

• Oil Fill Cap/Baffles: Specialized caps or internal baffles are designed to prevent oil splash from escaping the valve cover through the oil fill hole, especially during high-RPM operation.

4. Specialized Accessories

Butler Performance also offers components for unique applications:

• Valve Covers—Late Model Pontiac LS Spacers: Recognizing the crossover between traditional and modern Pontiac performance, Butler provides spacers that allow builders to use taller LS-style rocker arms or components while maintaining proper valve cover sealing.

   

By focusing on high-quality materials and design that accounts for the demands of a high-performance valvetrain, Butler Performance ensures that the top of your Pontiac engine is both functional and aesthetically flawless.