Manley Severe Duty® Series Chevy L-99 Intake Valve Kit – 2.165 in. Head Dia., 5.200 in. O/A Length, 0.3133 in. Stem
$292.45
SKU: 12354-8
Available on backorder
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Manley Valve – Intake, Valve-L-92 P/F 2.165, +.300.
Discover the pinnacle of performance and racing excellence with Manley’s Severe Duty® Valves. Exhaust valves crafted from XH-428 material and Intake valves from NK-844 material, these valves stand as a testament to our unwavering commitment to superiority in the industry. Severe Duty® Valves outshine the competition in every aspect.
- 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.
GTIN: 00807298105895
| Weight | 3.000 lbs |
|---|---|
| Dimensions | 11.750 × 6.750 × 2.500 in |
| Product Market | Domestic |
| Head Diameter | 2.165 IN |
| Stem Diameter | 0.3133 IN |
| O/A Length | 5.200 IN |
| Tip Length | 0.160 IN |
| Margin Width | 0.055 IN |
| Seat Width | 0.100 IN |
| Top of Head | 7 Degree Dish |
| Underhead Angle | Pro Flo: 12.00 DEG |
| Underhead Radius | 3/8 IN |
| Cylinder Head | L-92 Cylinder Head |
| Valve Series | Severe Duty® Series |
| Valve Type | Intake |
| Product Type | Engine Intake Valve Kit |
| Valve Quantity | 8 |
| Engine Detail – Web | L-99, LS-3 |
Makes
Chevrolet
Engines
LS
Instructions: Enter a value in the un-shaded boxes below as they pertain to your engine.
Note: For pistons BELOW the block @ TDC – value in box must be a POSITIVE number (.000)
Note: For pistons ABOVE the block @ TDC – value in box must be a NEGATIVE number (-.000)
Note: For a DISH piston – value in box must be a POSITIVE number (0.0)
Note: For a DOME piston – value in box must be a NEGATIVE number (-0.0)
Note: Manipulate the DOME/DISH & PISTON to DECK volumes to get the ratio you want.
