We researched and compared the top crankcase evacuation systems designed for street-driven vehicles. Unlike full-race setups, street systems must balance effective crankcase vacuum with low maintenance and quiet operation. Our evaluation is based on manufacturer specifications, published industry standards, and aggregated owner feedback from thousands of real-world miles. We focus on systems that reduce blow-by, improve ring seal, and keep oil where it belongs without constant adjustment.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Moroso 85472 Crankcase Evacuation Kit Top Pick AN -10 inlet, dual outlet check valves, aluminum construction |
9.0 | 🛒 Check Price |
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Mighty Mouse Solutions PCV Street/Strip System Best for Forced Induction Dual -10 AN inlets, integrated check valve, billet aluminum |
8.8 | 🛒 Check Price |
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JEGS 555-52000 Crankcase Evacuation Kit Budget Friendly AN -10 inlet, single check valve, steel braided hose |
8.1 | 🛒 Check Price |
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Holley 120-150 Crankcase Evacuation System Versatile Fit Universal mount, -10 AN fittings, powder-coated steel |
8.4 | 🛒 Check Price |
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Pioneer Automotive 870010 Crankcase Evacuation Kit Easy Install Pre-assembled, -10 AN, single check valve, rubber hose |
7.8 | 🛒 Check Price |
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Speedmaster PCE308.1000 Crankcase Evacuation System Compact Design Compact aluminum body, -8 AN inlet, single check valve |
7.3 | 🛒 Check Price |
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Proform 141-949 Crankcase Evacuation System Classic Style Chrome-plated steel, -10 AN, dual outlets, no check valves |
7.5 | 🛒 Check Price |
1. Moroso 85472 Crankcase Evacuation Kit: Top Pick
In our evaluation, the Moroso 85472 stands out as a dependable street evacuation system. It uses dual check valves to maintain consistent vacuum and prevent oil from backing up into the engine. Owner feedback highlights its straightforward installation on common small-block and big-block engines. The kit includes AN -10 fittings and hose, so you don’t need to buy extra parts for typical setups.
However, the system is designed for engines with standard valve cover breather ports. If your valve covers have unusual thread sizes or locations, you may need adapter fittings. It also lacks a built-in filter for the outlet, which means you should route the hose to a catch can or vented area. Skip this if you need a fully sealed system with integrated filtration.
- Dual check valves prevent backflow into crankcase
- Compatible with most valve cover and header setups
- Includes all necessary fittings and hardware
Pros: Proven design with decades of owner feedback; High-quality aluminum resists corrosion
Cons: May require additional fittings for non-standard valve covers
2. Mighty Mouse Solutions PCV Street/Strip System: Best for Forced Induction
Mighty Mouse’s system is engineered specifically for street cars with turbochargers or superchargers. We compared its specifications against other kits and found its dual -10 AN inlets and integrated check valve provide superior flow under boost. Owner reviews on high-horsepower LS and modular Ford engines praise its ability to keep dipsticks in place and reduce oil leaks.
The billet aluminum body is durable, but the system’s premium price may not suit budget builds. It also requires a dedicated vacuum source (like a header collector or vacuum pump) to function optimally. If your engine is naturally aspirated with mild blow-by, a simpler setup may be more cost-effective.
- Designed for boosted applications up to 30 psi
- Billet aluminum construction with O-ring seals
- Includes pre-oiled bronze filter for clean venting
Pros: Handles high crankcase pressure from forced induction; Compact design fits tight engine bays
Cons: Higher cost than basic evacuation kits
3. JEGS 555-52000 Crankcase Evacuation Kit: Budget Friendly
The JEGS 555-52000 offers a no-frills approach to crankcase evacuation. Our research shows it provides adequate vacuum for most naturally aspirated street engines with moderate blow-by. Owner feedback indicates it installs easily on typical small-block V8s. The included steel braided hose and clamps get the job done without breaking the bank.
However, the single check valve is a limitation. In aggressive driving or high-rpm conditions, some owners report oil mist escaping under heavy deceleration. The steel braided hose is less flexible than PTFE-lined options, making tight routing tricky. Skip this if you have a high-horsepower engine or need a system that can handle sustained high-rpm operation.
- Cost-effective solution for reducing crankcase pressure
- Single check valve design for simple installation
- Includes hose clamps and mounting brackets
Pros: Very affordable compared to competitors; Works well on mild to moderate street engines
Cons: Single check valve may not prevent all backflow; Steel braided hose can be stiff to route
4. Holley 120-150 Crankcase Evacuation System: Versatile Fit
Holley’s 120-150 kit is designed for universal application across a wide range of street engines. We compared its mounting bracket design to others and found it offers the most adjustability. Owner reviews note it fits Ford, Chevy, and Mopar engines with minimal modification. The dual check valves provide reliable vacuum, and the powder coat finish holds up well to road debris.
That said, the steel construction adds weight, which may be a concern in weight-conscious builds. The check valves are sealed and cannot be cleaned or rebuilt; if one fails, you must replace the entire valve. This system is a solid choice for street-driven muscle cars and trucks, but not ideal for all-out racing where every ounce matters.
- Adjustable mounting bracket fits most engines
- Powder-coated steel resists rust and chipping
- Includes two check valves for reliable operation
Pros: Versatile bracket fits many engine bays; Durable powder coat finish
Cons: Heavier than aluminum competitors; Check valves not serviceable
5. Pioneer Automotive 870010 Crankcase Evacuation Kit: Easy Install
The Pioneer 870010 is aimed at DIY enthusiasts who want a straightforward installation. It comes pre-assembled with rubber hose and a single check valve. Owner feedback indicates it works acceptably on low-to-moderate horsepower street engines. The flexible rubber hose makes routing around headers and accessories easier than braided steel.
However, the rubber hose is not oil-resistant long-term; some owners report cracking after a few years. The single check valve may allow oil vapor to re-enter the crankcase during deceleration. This kit is best for budget builds or temporary setups, but not for engines that see frequent high-rpm use or extended driving.
- Pre-assembled for quick installation
- Flexible rubber hose for easy routing
- Single check valve included
Pros: Simple installation process; Flexible hose simplifies tight routing
Cons: Rubber hose can degrade with oil exposure; Single check valve less effective at high RPM
6. Speedmaster PCE308.1000 Crankcase Evacuation System: Compact Design
Speedmaster’s PCE308.1000 is one of the most compact systems we evaluated. It uses a small aluminum body with a -8 AN inlet. Owner feedback on street-driven small-block Chevys indicates it provides mild vacuum improvement. Its size makes it easy to mount in cramped engine compartments.
However, the -8 AN inlet is undersized for engines with significant blow-by. Some users report the check valve fails after a few thousand miles, allowing oil to seep back. The included hardware is basic. This system is suitable only for low-horsepower, low-mileage street cars. Skip it if you plan to push your engine hard or have a high-performance build.
- Small footprint fits tight engine bays
- Lightweight aluminum construction
- Includes mounting hardware and hose
Pros: Very compact and lightweight; Low cost entry point
Cons: Smaller inlet restricts flow on high-output engines; Check valve durability concerns reported
7. Proform 141-949 Crankcase Evacuation System: Classic Style
The Proform 141-949 is designed for enthusiasts who want a classic chrome look under the hood. It features dual -10 AN outlets that connect to each valve cover. Owner feedback notes it works well as a basic evacuation point when paired with a vacuum pump or header connection. The chrome finish adds a polished appearance to engine bays.
However, this kit does not include check valves, which are essential for preventing backflow. Without them, oil can be drawn back into the engine under certain conditions. The chrome plating is prone to chipping if tools contact it. This system is best for show cars that see limited street use and where check valves are purchased separately.
- Chrome finish for show car appearance
- Dual outlets for dual valve covers
- Includes hose and clamps
Pros: Attractive chrome plating; Dual outlet design for symmetrical routing
Cons: No check valves included; Chrome can chip over time
Frequently Asked Questions
What is a crankcase evacuation system and why do I need one on the street?
A crankcase evacuation system removes blow-by gases and pressure from the engine’s crankcase. On the street, it helps improve piston ring seal, reduce oil leaks, and prevent oil from being forced out of seals and dipsticks. It also reduces the risk of oil starvation at high RPM by maintaining consistent vacuum.
Will a crankcase evacuation system work with my stock PCV valve?
Most aftermarket evacuation kits are designed to replace or supplement the stock PCV system. Many systems include check valves that allow you to retain a PCV valve for low-load operation. However, for best performance, we recommend using the evacuation system as a standalone setup, especially on modified engines.
Do I need a vacuum pump to use a crankcase evacuation system?
Not necessarily. Many street-oriented systems use exhaust scavenging (via a check valve plumbed into the header collector) to create vacuum. Others rely on a dedicated electric or belt-driven vacuum pump. The systems in our guide are primarily designed for exhaust scavenging, but some can be adapted to a pump.
How do I route the hoses for a crankcase evacuation system?
Typically, you connect the inlet to a valve cover breather port or a dedicated crankcase port. The outlet routes to a catch can or to the exhaust via a check valve. Ensure the hoses are routed away from hot exhaust components and moving parts to avoid melting or chafing. Use high-temperature hose if needed.
Can I use a crankcase evacuation system on a daily driver?
Yes, many systems are designed for street use. The key is to choose a system with durable check valves and oil-resistant hoses. Some owners prefer to add a catch can to trap oil mist and reduce maintenance. For daily driving, avoid systems that require frequent cleaning or that vent raw oil into the engine bay.
Our Verdict
After researching and comparing the options, our top pick is the Moroso 85472 for its proven reliability and dual check valves that work well on the street. For forced induction builds, the Mighty Mouse PCV Street/Strip System is the clear runner-up, offering superior flow and durability under boost. Choose based on your engine’s power level and budget.
