SKU: FERF1547P
Ferrea Acura K20 31mm 5.45mm 109.15mm 30 Deg Flo Dish Head +1mm Comp Plus Exhaust Valve – Set of 8
The Ferrea FERF1547P Competition Plus Exhaust Valves are a high-performance upgrade for Acura/Honda K20 engines (K20A/K20Z series). Featuring a 31mm head diameter (+1mm over stock), 5.45mm stem, 109.15mm overall length, 30-degree flo dish head design, and single-groove lock, these valves are engineered for high-RPM racing and boosted applications. Made from ultra-high-tensile-strength stainless steel with special heat-treatment and hard chrome stems, they offer exceptional durability, heat resistance, and flow characteristics. The flo dish head reduces weight while maintaining strength, improving exhaust gas flow and engine breathing. Sold as a set of 8, these valves are ideal for naturally aspirated or turbocharged K20 builds seeking maximum power, reliability, and valve train stability under extreme conditions.
Key Features & Benefits
- +1mm Oversized Head (31mm) Increases flow potential for higher horsepower and torque
- Flo Dish Head Design Reduces valve weight, improves exhaust scavenging, and enhances high-RPM performance
- Ultra-High-Tensile Stainless Steel Superior strength and heat resistance for racing/boosted durability
- Hard Chrome Stem & Special Heat Treatment Reduces friction, wear, and galling for extended valve life
- Ferrea Competition Plus Series Trusted in motorsports for precision, reliability, and extreme conditions
| Specification | Detail |
|---|---|
| Part Number | FERF1547P |
| Brand | Ferrea |
| Application | Acura/Honda K20 engines (K20A/K20Z) |
| Valve Type | Competition Plus Exhaust |
| Head Diameter | 31mm (+1mm over stock) |
| Stem Diameter | 5.45mm |
| Overall Length | 109.15mm |
| Head Angle | 30 Degree Flo Dish |
| Material | Ultra-High-Tensile Stainless Steel |
| Stem Treatment | Hard Chrome |
| Quantity | Set of 8 |
Whats Included
- Set of 8 Competition Plus exhaust valves 31mm head, 5.45mm stem, 109.15mm length
Product Notes
- Designed for high-RPM racing and boosted K20 applications excellent flow and durability
- Flo dish head reduces weight while maintaining structural integrity for high-lift cams
- Compatible with stock or aftermarket valve seats/guides (check seat compatibility for +1mm)
- Recommended for use with Ferrea valve springs/retainers for full valve train upgrade
- Precision-machined in the USA Ferrea’s motorsports-proven quality
Installation Notes
- Estimated time: 4-8 hours (full head work recommended)
- Requires cylinder head removal and professional valve job/seat cutting
- Install with proper valve stem seals, keepers, and springs
- Check valve-to-piston clearance, especially with +1mm oversized valves
- Professional engine builder installation strongly recommended for high-performance setups
This Part Fits
| Year Range | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2002-2006 | Acura | RSX | K20A2 / K20Z1 | Exhaust valves – high-performance upgrade |
| 2006-2011 | Honda | Civic Si | K20Z3 | Exhaust valves – high-performance upgrade |
| 2008-2012 | Honda | Accord / TSX | K20A / K20Z | Exhaust valves – high-performance upgrade |
| Various | Honda/Acura | K20-Powered Vehicles | K20A/K20Z Series | Exhaust valves – custom racing/turbo builds |
Why Choose Ferrea Competition Plus Valves?
- Ultra-high-tensile stainless steel for extreme RPM and boost durability
- Flo dish design improves flow and reduces weight for better high-RPM performance
- Hard chrome stems and precision machining for reduced wear and consistent sealing
- Ferrea trusted in professional racing and high-performance engine builds worldwide
Frequently Asked Questions
- Q: Will these fit my K20A2 RSX Type-S?
A: Yes, direct fit for K20A/K20Z series exhaust valves; +1mm oversize for increased flow. - Q: Are these suitable for turbo or high-boost setups?
A: Yes, Competition Plus series is engineered for high-heat, high-RPM, and boosted applications. - Q: Do I need to upgrade valve springs?
A: Recommended for high-RPM or boosted use; pair with Ferrea springs/retainers to prevent float.
Shipping and Handling
- Method: UPS / FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 2-3 lbs (set of 8 valves)
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