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Earls Oil Fill Cap w/ PCV Vent

Oil Fill Cap w/ Baffle & -10 ORB Port - Fits Holley Cast Aluminum Valve Covers for the GM LS Series Engines w/ 1-5/16"-12 Threads on the Cap.

PART# 3434120ERL

$22.17   Suggested Retail
$17.96   Holleydays Price
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These late model valve cover fill caps screw into the valve cover like an ordinary cap. These caps feature a baffle & -10 ORB (7/8"-14 Straight Thread O-Ring Style Port) for use w/ AN O-Ring Fitting (or Port hose end) & AN hose to the catch tank or PCV. These caps eliminate the need to modify your valve covers when adding a catch tank to your racing engine (required by most sanctioning bodies in racing applications). Choose from two versions w/ one that fits OEM valve covers (GM LS, GM Gen-V LT, & Ford Coyote), and the second version that fits Holley Cast Aluminum GM LS Valve Covers. Billet aluminum construction w/ black anodized finish. Use w/ ORB (O-Ring Port) hose end AT849010ERL, or O-ring Port to AN Flare Adapter AT985010ERL (straight), or AT949010ERL (90 Degree) & AN hose to the Catch Tank.


  • Easy Way to Add Catch Tank to Racing Engine w/o Modifying the Valve Cover
  • Screws Into Valve Cover Like an Oil Fill Cap
  • -10 ORB (7/8"-14 Straight Thread) O-Ring Boss Port for Use w/ AN Hose to Catch Tank or PCV
  • Use w/ O-Ring Port Hose End AT849010ERL, or O-Ring Adapter AT985010ERL (straight) or At949010ERL (90 degree)
  • Internal Baffle Inside Cap – Helps to Reduce Transfer of Oil to Catch Tank
  • Billet Aluminum Construction w/ Black Anodized Finish
  • Fits Holley Cast Aluminum LS Valve Covers


Adapter AN Size ( A )10 ORB Port
Adapter TypeBreather
Emission Code3
FinishAnodized Black
Product TypeValve Cover Accessories
Thread Size1-5/16"-12
Part Number3434120ERL

Service Parts



This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
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      Some parts are not legal for use in California or other states with similar regulations.

       X  Holleydays 2020 20% off and DD
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