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Manley Performance

Manley Performance BBC S/D 1.900in Exhaust Valves

MPN: 11811-8 Catalog #: 001520004 Category: Valves Check Vehicle Fitment

Product Details

Exhaust Valve - Severe Duty - 1.900 in Head - 0.342 in Valve Stem - 5.522 in Long - Stainless - Big Block Chevy - Set of 8

Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.

Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.522in O/A Length, 0.3415in Stem

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Engine Compatibility

GM - BBCMatched variant: BBC

Big Block Chevy; 396/427/454/572

Fitment note: Engine compatibility is provided as a guide. Please verify all fitment details before ordering.

Product Specs

Brand
Manley Performance
Part Number
11811-8
Catalog Number
001520004
Product Line
Valves
Category
Engines & Parts
Type
Valves
UPC / Barcode
807298053035
Vendor Product Category
Engine Components
Vendor Product Subcategory
Valves
Length
11.75 in
Width
6.75 in
Height
2.50 in
Weight
4.00 lb
Units Per SKU
1
Freight / LTL
No
Ship Alone
No
Air Restricted
No
Prop 65
Y
CARB Approved
Yes
Clearance Item
No

Shipping & Availability

Current status Special Order
Estimated timing Ships directly from manufacturer

This item is fulfilled directly by the manufacturer/vendor and never stocked. Estimated ship times may vary.

PROP 65 WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

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