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Part number: 11398H-8
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Product Details
Manley 11398H-8 Domestic - Race Series Valves

Manley Performance has been manufacturing the finest stainless steel valves for over 40 years. Manley valves have been the standard of the industry since their inception; a fact that still remains true today as weve entered into new markets.

Manley Performance Chevy LS, Ford Modular, and Chrysler SB HEMI stainless steel valves utilize our exceptional Race Series alloy and are manufactured to the highest quality standards.

Manley valves are designed to outflow and outperform all others even in the most severe environments. Manley stainless valves feature gorgeous yet durable chrome stems, swirl polished under heads, fully hardened tips, completely machined combustion faces, closely controlled margin heights, and exact stem to seat concentricity to render a finished product that is unsurpassed.

Manley intake valves typically are built with our original Pro-Flo design which reduces the stem diameter in the fillet area for increased airflow but also less valve weight. This concept is executed on our Chevy LS and Chrysler HEMI parts.

In certain specific applications, Manley offers our Extreme Duty exhaust material. Our Extremealloy alloy offers more hot hardness and high temperature strength than our competitors offerings. This alloy is ideal for extremely high boosted applications where the exhaust gas temperatures reach what seem like unthinkable levels. In the case of the Ford Modular 4.6L and 5.4L 3 valve cylinder head engine, we chose to use Extremealloy.

Manley stainless valves are suitable for all applications ranging from the mild street performer to the jaw dropping 1000+ horsepower race cars competing at the drag strip.

Manley has been at the forefront with these niche markets; developing better flowing and stronger aftermarket valves for the Chevy LS and Ford Modular market before our competition. We were the first to offer L-92 valves and our hollow LS valves are the very best in the industry.

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D
Excellent price and fast shipping. Product showed up as described and timely.
R
easy purchase,delevery took way to long
K
Great price. Very happy with order. Will buy from them again.
A
absolutely lowest price on my Griffin radiator and super fast with the shipping to boot, what more could you ask for!
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Fitment
Cadillac CTS
2005 Cadillac CTS ALL / V
2004 Cadillac CTS ALL / V
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2002 Chevrolet Camaro ALL / SS / Z28
2001 Chevrolet Camaro ALL / SS / Z28
2000 Chevrolet Camaro ALL / SS / Z28
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2004 Chevrolet Corvette ALL / Base / Z06
2003 Chevrolet Corvette ALL / Base / Z06
2002 Chevrolet Corvette ALL / Base / Z06
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Pontiac Firebird
2002 Pontiac Firebird FIREHAWK / ALL / Formula / Trans Am
2001 Pontiac Firebird FIREHAWK / ALL / Formula / Trans Am
2000 Pontiac Firebird FIREHAWK / ALL / Formula / Trans Am
1999 Pontiac Firebird FIREHAWK / ALL / Formula / Trans Am
1998 Pontiac Firebird FIREHAWK / ALL / Formula / Trans Am
Pontiac GTO
2004 Pontiac GTO ALL / Base
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