Manley Chevy LS-7 Small Block Severe Duty/Pro Flo Intake Valves (Set of 8)

SKU: MAN11688-8

Valves

MAN Severe Duty Valves...

Manley Performance

Manley Chevy LS-7 Small Block Severe Duty/Pro Flo Intake Valves (Set of 8)

SKU: MAN11688-8

Valves

MAN Severe Duty Valves...

Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.

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Description

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.

Part Type

Engine Intake Valve

Data: v4.2 - Upd: 2026-10-13 19:35:57

Features

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

Specifications

Product Attributes - Brand: Manley
Product Attributes - Manufacturer's Part Number: 11688-8
Product Attributes - Part Type: Valves
Product Attributes - Product Line: Manley Severe Duty Pro Flo Series Stainless Steel Valves
Product Attributes - UPC: 807298066479
Product Attributes - Valve Position: Intake
Product Attributes - Intake Valve Head Diameter (in.): 2.205 in.
Product Attributes - Intake Valve Head Diameter (mm): 56.007mm
Product Attributes - Intake Valve Stem Diameter (in.): 0.313 in.
Product Attributes - Intake Valve Stem Diameter (mm): 7.95mm
Product Attributes - Intake Overall Valve Length (in.): 5.200 in.
Product Attributes - Intake Overall Valve Length (mm): 132.080mm
Product Attributes - Undercut Stem: Yes
Product Attributes - Swirl-Polished: Yes
Product Attributes - Valve Tip Length (in.): 0.300 in.
Product Attributes - Valve Tip Length (mm): 7.620mm
Product Attributes - Valve Material: NK-844 stainless steel
Product Attributes - Lock Groove Quantity: 1-groove
Product Attributes - Lock Groove Style: Conventional
Product Attributes - Approximate Weight (g): 120
Product Attributes - Valve Head Style: 7 degree dish
Product Attributes - Valve Seat Width (in.): 0.085 in.
Product Attributes - Quantity: Sold as a set of 8.

Reference Information

Brand Name/s	Manley Performance
StreetFX SKU	man11688-8
SFX Item ID	4060398
Supplier Item Code	4060398
Manufacturer SKU	11688-8
Manufacturer UPC	807298066479
Alternative References	LS-7