Name: Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.021in O/A Length, 0.3415in Stem
Brand: Manley Performance
SKU: MAN11569-8
Price: 301.07 USD

Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.021in O/A Length, 0.3415in Stem

Manley Performance
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Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.021in O/A Length, 0.3415in Stem

Manley Performance
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SKU: MAN11569-8
Barcode: 807298050423

Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these... Read more

Out of stock, 1-3 weeks

$401.42 $301.07

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Shipped today? Order within: Jul 17, 2026 16:00:00 -0400

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We are committed to providing a fast, reliable, and hassle-free shopping experience. Every order is carefully packaged to ensure it arrives safely and in perfect condition.

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Most orders are processed and shipped within 1 business day, with delivery typically taking 1–4 business days. We proudly offer FREE shipping throughout the contiguous 48 United States on qualifying orders.

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Your satisfaction is important to us. If you're not completely happy with your purchase, you may return or exchange eligible items within 15 days of receiving your order. Items must be unused, in their original packaging, and in resalable condition to qualify for a return or exchange.

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Description

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.

Specifications

Type: Aftermarket
Usage: Street Use & Speedway

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Returns & Delivery

When will my order be delivered?

Delivery typically takes 1–4 business days. After placing your order, you will receive an email with shipping updates, tracking information, and any additional details needed to ensure a smooth delivery process.

Can I return my product?

Orders may be returned or exchanged within 15 days of receiving the parcel, provided the items are in their original, resalable condition. Customers are responsible for return shipping costs unless the return is due to an error made by Gearhead Motoring, in which case we will cover all shipping costs. Please wait for an RMA number and return instructions before sending any item back. Items returned without an RMA will not be accepted.

What can I do if my item (or part of it) is damaged?

Damaged Shipments

If your shipment arrives damaged, whether visible upon delivery or discovered after opening the package, please follow these steps immediately:

Contact Gearhead Motoring as soon as possible and submit a damage claim at shipping@gearheadmotoring.com
Keep all original packaging materials, including the box and packing materials.
Make a list of any damaged or missing items.
Take clear photos of the damaged packaging and the affected products.
If the delivery driver cannot wait for an inspection, or does not allow you to inspect the shipment, write "SUBJECT TO INSPECTION" on the delivery receipt before signing and ask the driver to acknowledge it.

Once we receive the required information, Gearhead Motoring will work directly with the shipping carrier and arrange a pickup if necessary. Do not return any merchandise without prior written authorization and an RMA number from Gearhead Motoring.

After the returned product is received and inspected, we will notify you whether the item will be replaced, or if a refund or store credit will be issued.

Important: By signing and accepting a freight shipment, you may waive your right to file a damage claim for any damage not noted on the delivery receipt. We strongly recommend inspecting all freight shipments upon arrival, even if the outer packaging appears to be in good condition.