Manley Performance · Clearance
Manley Chevy LS-1/LS-2 Small Block 1.575 Pro Flo Severe Duty Exhaust Valves (Set of 8)
MPN 11675-8 · Store SKU man11675-8
Supplier stock checked 11/7/2026, 7:24:37 AM UTC. Adding a part does not reserve it.
Clearance and scratch-and-dent parts are final sale. No returns or refunds.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
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. Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923 Manley Valve - Exhaust, Valve-LS1 S/D 1.575
Manufacturer fitment & guides
Check 11675-8 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- California Proposition 65: Y
- Clearance item. All sales are final under the supplier clearance policy.
