Howards Cams Extreme Black Severe Application Valves

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These Extreme Black Severe Application valves by Howards Cams are engineered for high-rpm and high-horsepower applications. They feature a gloss black nitride finis

These Extreme Black Severe Application valves by Howards Cams are engineered for high-rpm and high-horsepower applications. They feature a gloss black nitride finish and are perfect for high temperatures (they run cooler, which improves valve life), nitrous, turbo, and supercharger applications. These valves will give naturally aspirated motors a much greater cylinder flow for good horsepower gains. These valves start off as a one-piece forged high-temperature, high-nickel, stainless steel alloy. They're CNC-finished to strict tolerances, making them the choice for the most demanding race classes. Their black nitride micro-hardness is higher than the stainless steel base material. No process can match it for surface hardness! The surface finish is smoother than with chromed stems, having less friction between the stem and the guide. The black nitride reduces power loss due to there being less valve-guide friction. Their nitride finish is not a coating--it's a process whereby it actually becomes part of the steel, making them ideal for the most demanding applications.

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Howards Cams Extreme Black Severe Application Valves 16011N

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.000 in. Length, Chevy, Each

Part Number: HRS-16011N

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Howards Cams Extreme Black Severe Application Valves 20511N

Valve, Intake, Stainless Steel, 2.055 in. Diameter, .341 in. Stem, 5.000 in. Length, Chevy, Each

Part Number: HRS-20511N

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Howards Cams Extreme Black Severe Application Valves 20811N

Valve, Intake, Stainless Steel, 2.080 in. Diameter, .341 in. Stem, 5.000 in. Length, Chevy, Each

Part Number: HRS-20811N

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Howards Cams Extreme Black Severe Application Valves 20208N

Valve, Intake, 2.02 in. Diameter, 8mm Stem Diameter, 4.9 in. Overall Length, Chevy, LS, Each

Part Number: HRS-20208N

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Howards Cams Extreme Black Severe Application Valves 18811N

Valve, Extreme Black Severe Application, Intake 1.880 in., 0.344 in. Valve Stem, 5.522 in. Length, Stainless Steel, Each

Part Number: HRS-18811N

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Howards Cams Extreme Black Severe Application Valves 15001N

Valve, Exhaust, 1.500 in. Head Diameter, 8.73mm Stem Diameter, 4.911 in. Overall Length, Chevy, Small Block, Each

Part Number: HRS-15001N

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Howards Cams Extreme Black Severe Application Valves 22521N

Valve, Intake, 2.25 in. Diameter, 11/32 in. Stem Diameter, 5.494 in. in. Overall Length, Chevy, Big Block, Each

Part Number: HRS-22521N

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Howards Cams Extreme Black Severe Application Valves 19401N

Valve, Intake, 1.940 in. Head Diameter, 8.73mm Stem Diameter, 4.911 in. Overall Length, Chevy, Small Block, Each

Part Number: HRS-19401N

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Howards Cams Extreme Black Severe Application Valves 16008N

Valve, Exhaust, 1.6 in. Diameter, 8mm Stem Diameter, 4.92 in. Overall Length, Chevy, LS, Each

Part Number: HRS-16008N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Howards Cams Extreme Black Severe Application Valves 20211N

Valve, Intake, 2.020 in. Head Diameter, 8.73mm Stem Diameter, 5.011 in. Overall Length, Chevy, Small Block, Each

Part Number: HRS-20211N

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Howards Cams Extreme Black Severe Application Valves 21608N

Valve, Intake, 2.165 in. Diameter, 8mm Stem Diameter, 4.9 in. Overall Length, Chevy, LS, Each

Part Number: HRS-21608N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Howards Cams Extreme Black Severe Application Valves 16018N

Valve, Exhaust, 1.6 in. Diameter, 8mm Stem Diameter, 5.02 in. Overall Length, Chevy, LS, Each

Part Number: HRS-16018N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Howards Cams Extreme Black Severe Application Valves 16001N

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.900 in. Length, Chevy, Each

Part Number: HRS-16001N

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Howards Cams Extreme Black Severe Application Valves 23021N

Valve, Intake, 2.3 in. Diameter, 11/32 in. Stem Diameter, 5.494 in. in. Overall Length, Chevy, Big Block, Each

Part Number: HRS-23021N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

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COMP Cams Sportsman Stainless Steel Valves 6021-8

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Estimated Ship Date: Dec 14, 2026

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Howards Cams Extreme Black Severe Application Valves 20501N

Valve, Intake, Stainless Steel, 2.055 in. Diameter, .341 in. Stem, 4.900 in. Length, Chevy, Each

Part Number: HRS-20501N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Howards Cams Extreme Black Severe Application Valves 20201N

Valve, Intake, 2.02 in. Diameter, 11/32 in Stem Diameter, 4.911 in. Overall Length, Chevy, Small Block, Each

Part Number: HRS-20201N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Need It Sooner? We recommend these similar substitute parts:

COMP Cams Sportsman Stainless Steel Valves 6004-8

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Estimated Ship Date: Dec 14, 2026

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Howards Cams Extreme Black Severe Application Valves 23031N

Valve, Intake, 2.3 in. Diameter, 11/32 in. Stem Diameter, 5.594 in. in. Overall Length, Chevy, Big Block, Each

Part Number: HRS-23031N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

Howards Cams Extreme Black Severe Application Valves 21618N

Valve, Intake, 2.165 in. Diameter, 8mm Stem Diameter, 5 in. Overall Length, Chevy, LS, Each

Part Number: HRS-21618N

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Estimated Ship Date: Dec 21, 2026 if ordered today

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Estimated Ship Date: Dec 21, 2026 if ordered today

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