Granatelli Motor Sports Press-In PCV Breather 451001

Granatelli Press-In PCV Valve Cover Breather

SKU: 451001

The Granatelli Motor Sports Press-In PCV Breather Valve Cover Breather Kit with Baffle is the clean, no-weld solution for adding a 1" press-in breather or PCV-style breather to valve covers that don’t already have breather provisions—or when you need an extra breather in a new location. Designed for performance builds where crankcase ventilation matters, this kit helps you add a breather setup without the hassle of welding, fabrication, or permanent modifications beyond drilling a properly sized hole.

No Welding Required – Simple, Secure Installation

This kit is ideal for builders who want a professional look and function without welding. The 451002 kit features a 1" double O-ring I.D. female receptacle that accepts most push-in breathers, plus it includes the supplied PCV-style unit so you can install and go. The design provides a tight, reliable seal and makes it easy to service or change breathers later.

Baffled Design Helps Prevent Oil Push-Out

Oil mist and splash can be a problem with breathers—especially on performance engines, high RPM setups, and boosted applications. That’s why this kit includes a baffled system designed to help prevent unwanted oil from pushing out of the breather. The baffle helps control oil and vapors at the source so your engine bay stays cleaner and your breather system works the way it should.

What’s Included

• Threaded baffle (baffled to reduce oil push-out)
• 1" double O-ring I.D. female receptacle (fits most push-in breathers)
• PCV-style breather unit (included)
• Lock nut for secure mounting
• Sealing washer
• O-ring for leak-resistant sealing

Drill Size Requirement

The baffle requires an appropriately sized 1.375" hole to be drilled into the valve cover for proper installation and fitment.

Perfect For

• Valve covers with no existing breather holes
• Add-on breather locations when an extra breather is required
• Performance engines needing improved crankcase ventilation
• Builders who want a clean, functional install with no welding