# Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (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.

-   Swirl polishing and machined faces improved airflow/optimized efficiency
-   Exotic alloys for superior tensile strength, reliability, and longevity
-   Proven fatigue strength for extreme performance
-   Chrome stems and hard tips enhance durability

## Details

- **Price:** 444.17 CAD
- **Vendor:** Manley Performance
- **Type:** Valves

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 444.17 CAD | In stock |

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/manley-chevy-l83-5-3l-1-560in-head-diameter-pro-flo-severe-duty-exhaust-valve-set-of-8)
> Updated: 2026-09-01