Manley 12320-8 Race Flo 2.125in Intake Valve Set +.200 Longer SBC AFR Heads

With a lightweight 8mm (.3110 in.) stem diameter and LS-style (.060" single radius) Bead Loc keeper grooves, these valves are purpose-built for bracket, drag, and oval track racing engines operating below 8,000 RPM.

Key Features:

• Head Diameter: 2.125 in.
• Stem Diameter: .3110 in. (8mm lightweight stem)
• Overall Length: 5.110 in. (+.200 in. longer than standard)
• Tip Length: .290 in.
• Underhead Angle / Radius: Pro Flo 10° x 3/8"
• Margin: .050 in.
• Seat Width: .080 in.
• Top of Head: 5° Dish
• Weight: 117 grams per valve
• Material: NK-842 high-performance stainless steel intake alloy
• Chrome stems with .0002" hard coating for superior wear resistance
• Hardened valve tips for long-term durability
• Swirl polished underhead areas and fully machined combustion faces for optimized airflow
• LS-style (.060" single radius) Bead Loc keeper grooves — Bead Loc valve locks required

Compatible Cylinder Heads: AFR 180cc, 190cc, 195cc, 210cc, 220cc, 227cc, 235cc, and 245cc Series.

Note: Use Manley valve lock P/N 13098-16 (7°) or 13153-16 (10°) depending on your spring and retainer choice. Manley strongly recommends that all guides be checked and correctly sized for the .3110" stem diameter to achieve proper clearances — machine work may be required.

The Race Flo / Race Master series is manufactured using NK-842 intake material, delivering superior fatigue strength and high-temperature performance for demanding racing and high-performance street applications.