BK Racing F23 Overflow Catch Can Vent Kit – High-Flow Racing Vent System & Fluid Control Upgrade

Read why the F23 violently spews fluid under racing conditions →

The BK Racing F23 Overflow Catch Can Vent Kit was engineered specifically for one of the most frustrating and overlooked problems plaguing hard-driven F23-equipped Ecotec cars: transmission fluid violently spewing out of the factory vented cap under high RPM racing operation.

Once wheel hop, aggressive launches, elevated transmission temperatures, traction blocks, sticky tires, and sustained RPM enter the equation, the factory F23 vent system quickly becomes overwhelmed. Internal case pressure rises, fluid becomes aerated, and the transmission begins forcing fluid directly out of the vent cap — coating the engine bay, transmission case, chassis, and surrounding components in gear oil.

For years, many racers — including us — tried underfilling the transmission below the GM specified fluid level just to reduce the mess. While this sometimes helped control vent blowout, it also meant compromising lubrication capacity inside the gearbox during the exact conditions where the drivetrain needed protection the most.

The BK Racing F23 Overflow Catch Can Vent Kit solves the problem correctly.

Instead of allowing fluid and pressure to escape uncontrolled through the factory vented cap, the BK Racing system reroutes transmission venting through a high-flow braided stainless line into a dedicated baffled overflow expansion canister designed specifically to control fluid movement under aggressive racing conditions.

This allows racers to safely run the FULL GM specified fluid level while properly managing transmission case pressure and aerated fluid expansion during hard operation.

This becomes especially critical when running aggressive drivetrain upgrades such as:

• BK Racing F23 Traction Blocks
• Sticky race tires and hard launches
• High RPM racing environments
• Aggressive dirt oval or autocross setups
• Steel braided clutch lines with elevated clutch shock loading
• Wheel hop reduction drivetrain setups
• Elevated horsepower Ecotec combinations

As drivetrain traction and shock loading increase, the F23 transmission experiences dramatically higher internal fluid movement and pressure instability than GM originally designed the factory vent system to control.

The BK Racing vent racing system was engineered specifically around these real-world racing conditions.

Kit Includes:

• High-flow billet vent cap adapter replacing the restrictive factory vented cap
• 24” stainless braided PTFE vent line for heat-resistant routing
• Compact baffled aluminum overflow expansion canister with drain
• AN fittings and hardware for secure leak-free installation

Performance Benefits:

• Helps eliminate transmission fluid spewing from the factory vented cap
• Allows safe operation at the FULL GM specified fluid capacity
• Expansion canister safely captures overflow fluid under load
• Cleaner engine bay and chassis during racing operation
• Improved drivetrain reliability during sustained high RPM use
• Reduces fluid loss during aggressive launches and cornering
• Improved vent control for traction block and high-grip setups
• Race-proven solution for serious F23 performance builds

Perfectly Paired With:

• BK Racing F23 Traction Blocks
• BK Racing Steel Braided Clutch Line
• BK Racing Drivetrain Mount Systems
• BK Racing F23 ARP Ring Gear Bolts
• BK Racing F23 Axle Seal Systems

Compatibility:

• Getrag F23 5-Speed Manual Transmissions
• Chevrolet Cavalier
• Pontiac Sunfire
• Chevrolet Cobalt
• Pontiac G5
• Saturn Ion
• Chevrolet HHR
• Ecotec F23 swap applications

The BK Racing F23 Overflow Catch Can Vent Kit was developed from firsthand experience dealing with the exact problems serious Ecotec racers encounter once the drivetrain starts seeing real abuse. This is not a cosmetic accessory — it is a true drivetrain reliability upgrade engineered specifically for aggressive F23 racing environments.

If you are tired of transmission fluid coating the engine bay every time the car is driven hard, the BK Racing F23 Overflow Catch Can Vent Kit delivers the high-flow vent racing control serious Ecotec racers trust.

Frequently Asked Questions

Are catch cans bad for your transmission?
No. This transmission overflow catch can is designed to manage vented fluid under load and help protect the drivetrain in racing conditions.

How often do you need to drain the overflow catch can?
Drain it as needed based on racing use, heat, and fluid movement. Check it regularly after hard launches or extended high-RPM sessions.

Is this kit meant for stock street use?
This kit is designed for aggressive F23 performance builds, racing conditions, and hard-driven Ecotec applications where the factory vent system can become overwhelmed.

Can I still run the full GM fluid level?
Yes. The kit is designed to help manage pressure and overflow so racers can safely run the FULL GM specified fluid capacity.

Will this change how the factory vented cap works?
Yes. The kit replaces the restrictive factory vented cap with a high-flow vent routing system and overflow canister to better control fluid movement under load.

Does this help keep fluid out of the engine bay?
Yes. The system is designed to capture overflow fluid and reduce transmission fluid spewing onto the engine bay, chassis, and surrounding components.

Which is better, an air oil separator or catch can?
For the F23 transmission, this kit is a transmission overflow catch can system made to control vented fluid under racing load, not an engine oil separator.

Is this an engine oil catch can or crankcase ventilation kit?
No. This is a transmission overflow catch can for the F23 and is not intended for crankcase ventilation or PCV system use.

overflow tank

oil catch can

high performance engine

catch can with filter

engine bay space

factory pcv system

forced induction

cad designed

aluminum mounting bracket

professioally tig welded

tig weldedintegrated coolant overflow tank

built in coolant overflow tank

coolant overflow hose

coolant reservoir

angled oil catch can

oil vapors are vented

crankcase blow-by oil

oil vapors

factory battery and fuse box

heavily modified naturally aspirated engines

breather plate

ease of installation

vented to the atmosphere

factory plastic unit

catch can dimensions

state of the art technology

cnc press punched

-10an weld fittings

1/8"npt female weld bungs

professionally tig welded