Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity and wear resistance.Swirl Polished and Fully Machined: The valves feature swirl polished under head areas and fully machined combustion faces to optimize airflow and combustion efficiency.Variety of Shapes: Choose between Race Master (Straight Stem) and Race Flo shapes to suit your racing engine's specific requirements.Recommended for Alcohol Engines: These valves are the recommended choice for exhaust valves in alcohol engines, ensuring reliable performance even in demanding conditions.

This Part Fits:

Year	Make	Model	Submodel
2007-2008	Ford	F-150	FX2
2005-2008	Ford	F-150	FX4
2006-2008	Ford	F-150	Harley-Davidson Edition
2005-2008	Ford	F-150	King Ranch
2005-2008	Ford	F-150	Lariat
2008	Ford	F-150	Limited
2005-2008	Ford	F-150	XL
2005-2008	Ford	F-150	XLT
2008	Ford	F-250 Super Duty	FX4
2006-2008	Ford	F-250 Super Duty	King Ranch
2006-2008	Ford	F-250 Super Duty	Lariat
2006-2008	Ford	F-250 Super Duty	XL
2006-2008	Ford	F-250 Super Duty	XLT
2008	Ford	F-350 Super Duty	FX4
2006-2008	Ford	F-350 Super Duty	King Ranch
2006-2008	Ford	F-350 Super Duty	Lariat
2006-2008	Ford	F-350 Super Duty	XL
2006-2008	Ford	F-350 Super Duty	XLT
2005-2008	Ford	Mustang	GT
2007-2008	Ford	Mustang	Shelby GT