Skip to content
Manley Chevrolet 1.840 Dia Dish 5.140 O/A Length Severe Duty Intake Valves (Set of 8)

Manley Chevrolet 1.840 Dia Dish 5.140 O/A Length Severe Duty Intake Valves (Set of 8)

by Manley Performance
Sale Sale
$395.52
$395.52 - $395.52
$395.52
$296.64
$296.64 - $296.64
$296.64
SKU MAN11820-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust valves, tested at 40,000 psi and 1400?F, impressively endured up to 100,000,000 (one hundred million) cycles. In contrast, competitors' offerings failed after just 100,000 cycles, showcasing a staggering 1000 times better fatigue life.Designed for High Temperature Gasoline Engines: Engineered for superior performance in high-temperature gasoline engines.Chrome Stems and Hard Tips: Incorporating chrome stems and hard tips for enhanced durability and longevity.Optimized Combustion: Swirl polished under head areas and fully machined combustion faces for improved airflow and combustion efficiency.XH-428 for Exhaust: No competitor worldwide offers the exceptional XH-428 as exhaust valve material. It boasts nearly double the ultimate tensile strength at 1500?F compared to the competition's EV-8.NK-844 for Intake: Our intake valve material, NK-844, is equally unmatched, displaying over four times the ultimate tensile strength of the competition's best intake valve material at 1000?F.
Shipping/Returns

The following are the terms and conditions that constitute our Shipping Policy.

Domestic Shipping Policy

Shipment processing time

All orders are processed within 1-2 business days. Orders are not shipped or delivered on weekends or holidays. If we are experiencing a high volume of orders, shipments may be delayed by a few days. Back order items are subject to special shipping times. If there will be a significant delay in shipment of your order, we will contact you via email or telephone.

Shipping rates & delivery estimates

Standard Shipping is 2-5 days.

We offer free ground shipping for orders over $200 within the United States.

Shipping charges for your order will be calculated and displayed at checkout.

*Overnight delivery is only available for orders with delivery addresses within the continental United States.

**Delivery delays can occasionally occur

Shipment to P.O. boxes or APO/FPO addresses

RAV Performance​ ships to addresses within the U.S., U.S. Territories, and APO/FPO/DPO addresses.

Shipment confirmation & Order tracking

You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). The tracking number will be active within 24 hours.

Customs, Duties and Taxes

RAV Performance is not responsible for any customs and taxes applied to your order. All fees imposed during or after shipping are the responsibility of the customer (tariffs, taxes, etc.).

Damages

RAV Performance​ is not liable for any products damaged or lost during shipping. If you received your order damaged, please contact the shipment carrier to file a claim. Please save all packaging materials and damaged goods before filing a claim.

International Shipping Policy

We currently do offer international shipping within some countries. Please contact us by email or phone to place an order.