Ferrea 6000 Series Stock-Size Intake Valves for 2002–2005 WRX EJ20 & 2004–2021 STI EJ257 – 8-Piece

Description

TECH NOTE: These Ferrea Valves must be used with Ferrea Valve Locks # K10061.

The 6000 Series Competition Valves are designed to provide excellent reliability in an environment of high spring pressures and roller cams, at a budget price. They have higher fatigue resistance and tensile strengths than our competitor’s best offerings.
To manufacture the valves we use our exclusive two-step slow forging process using EV8 stainless steel on both intake and exhaust valves.We provide a special heat-treatment and stress relieving process, along with hard chrome stems and friction-welded hard tips. We finish with a swirl polished head. The valves feature flow improvements to deliver the power needed for today’s sophisticated racing engines.

Intake
Head Diameter: 36 mm
Stem Diameter: 5.97 mm
Overall Length: 104.6 mm
Tip Length: 3.5 mm
Reference: 19 Degree S. Flo. Radius Groove. Stock size.

Fitment:
2002:Subaru:Impreza:WRX, 
2003:Subaru:Impreza:WRX, 
2004:Subaru:Impreza:WRX, 
2005:Subaru:Impreza:WRX, 
2004:Subaru:Impreza:WRX STI, 
2005:Subaru:Impreza:WRX STI, 
2006:Subaru:Impreza:WRX STI, 
2007:Subaru:Impreza:WRX STI, 
2007:Subaru:Impreza:WRX STI Limited, 
2008:Subaru:Impreza:WRX STI, 
2009:Subaru:Impreza:WRX STI, 
2010:Subaru:Impreza:WRX STI, 
2010:Subaru:Impreza:WRX STI Special Edition, 
2011:Subaru:Impreza:WRX STI, 
2011:Subaru:Impreza:WRX STI Limited, 
2012:Subaru:Impreza:WRX STI, 
2012:Subaru:Impreza:WRX STI Limited, 
2013:Subaru:Impreza:WRX STI, 
2013:Subaru:Impreza:WRX STI Limited, 
2014:Subaru:Impreza:WRX STI, 
2014:Subaru:Impreza:WRX STI Limited, 
2015:Subaru:WRX STI:Base, 
2015:Subaru:WRX STI:Launch Edition, 
2015:Subaru:WRX STI:Limited, 
2016:Subaru:WRX STI:Base, 
2016:Subaru:WRX STI:Limited, 
2016:Subaru:WRX STI:Series.HyperBlue, 
2017:Subaru:WRX STI:Base, 
2017:Subaru:WRX STI:Limited, 
2018:Subaru:WRX STI:Base, 
2018:Subaru:WRX STI:Limited, 
2018:Subaru:WRX STI:Type RA, 
2019:Subaru:WRX STI:Base, 
2019:Subaru:WRX STI:Limited, 
2019:Subaru:WRX STI:S209, 
2020:Subaru:WRX STI:Base, 
2020:Subaru:WRX STI:Limited, 
2021:Subaru:WRX STI:Base, 
2021:Subaru:WRX STI:Limited, 

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