These Direct mount on valve covers to provide a new unrestricted can port
- LS 1997+ helix type GM oil cap and many Ford with one or two tabs in the valve cover.

-'Holley cast LS' that use 1 5/16"-12 threads (fits other popular v/c as well)

  NOT for 'sniper / fabricated' oil fill threads that are M32x2
-the 'breather base is made for any generic 1-1/4" grommet for push in breathers (not our breathers)
-for crankcase ventilation HP ratings are: -6AN=600HP capacity, -8AN=800, -10AN=1000, and 12AN=1200HP maximum.

- The pressure release adapter is the original (and still the champ) one-way breather to add 1000hp of flow capability to your existing system! (GM / Ford helix type only)

Example Photos HERE
Made in the USA!

Oil Fill Adapters

Valve cover type

These parts are in stock and usually go out in 1 business day USPS first class unless combined with another order.

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