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Description
Manley Chevy Small Block Severe Duty Valves (Set of 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
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 Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 4
Very interesting
Format: Paperback
A book that highlights how information is collected and stored by law enforcement
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Reviewed in the United States on August 17, 2018
★★★★★ 1
Poor quality: falling apart
Format: Paperback
Book was falling apart at seam when I received it and I left feedback about the poor condition of the book.
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Reviewed in the United States on April 6, 2022
★★★★★ 5
Liquid Gold for Old Engines
Style: Full Synthetic High Mileage, Size: 5 qt (Pack of 1), Configuration: 5W-30
Valvoline Full Synthetic High Mileage with MaxLife Technology SAE 5W-30 Motor Oil for my car. Designed specifically for vehicles with over 75,000 miles, this oil provides exceptional performance and protection. Its advanced formula includes conditioners that help rejuvenate seals and reduce oil leaks—something I noticed right away after switching to this product.
I’ve noticed less engine noise, even during cold starts, which used to be a problem in the past. The wear protection offered by this motor oil is also impressive. Knowing it fights sludge and deposits gives me peace of mind, especially since I live in an area with fluctuating temperatures. Whether it’s a hot summer day or a cold winter morning, this oil performs consistently well. It’s also rated for excellent viscosity stability, which means it doesn’t thin out or degrade over time like some other oils I’ve tried.
Another thing I love about this product is how it helps improve fuel efficiency. Since I started using it, I’ve seen a slight but noticeable improvement in my gas mileage. I’ve also read that Valvoline includes anti-wear additives that extend engine life, and so far, that’s been true in my experience. My car doesn’t burn oil as quickly as it used to, so I’m not having to top it off as often as I did with other brands. The convenience of longer intervals between oil changes is a bonus.
Overall, Valvoline Full Synthetic High Mileage with MaxLife Technology SAE 5W-30 Motor Oil is an outstanding product for anyone with a high-mileage vehicle. It’s affordable, easy to use, and does exactly what it promises. Whether you’re trying to extend the life of your aging car or prevent costly repairs, this oil is a solid investment. I wouldn’t hesitate to recommend it to anyone looking to keep their car running smoothly for years to come.
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Reviewed in the United States on January 7, 2025
★★★★★ 5
So just use it in the long run you’ll love it
Style: Full Synthetic High Mileage, Size: 5 qt (Pack of 1), Configuration: 5W-30
The best quality , compatible with any engine advanced synthetic oil. Great value for the money it will save you money in the future. The fit is great easy to pour. The color is beautiful amber gold. I’ve been using Valvoline oil for 48 years. I’ve been a mechanic for 48 years and if you take apart an engine that has been using it , it is clean inside. If you take apart an engine that has been using a different brand they have a tar like build up in them. Like the old commercial use to say mechanics that know use only valvoline oil.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Good Oil and Great Price
Style: Full Synthetic High Mileage, Size: 5 qt (Pack of 1), Configuration: 0W-20
I get this oil for my daughter’s 2016 Corolla. It’s such a great price compared to auto part store. I do hope it’s the same quality as I get elsewhere! It seems to be a quality oil for my daughter’s 4cyl Corolla.
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Reviewed in the United States on June 1, 2026