Manley 12326-8 Intake Valve Set 2.200" Head .311" Stem 5.010" Length 8-Pack

These valves feature a 2.200" head diameter, a lightweight .311" stem diameter, and an overall length of 5.010" — making them .100" longer than the standard length for custom valvetrain geometry tuning. The 5° dish head profile and 10° x 3/8" keeper groove configuration are optimized for maximum flow and combustion efficiency.

Key Specifications:

• Valve Type: Intake
• Head Diameter: 2.200"
• Stem Diameter: .3110" (lightweight 8mm-style)
• Overall Length: 5.010" (+.100" longer than standard)
• Tip Diameter: .290"
• Keeper Groove: 10° x 3/8"
• Tip Undercut: .050"
• Margin: .080"
• Head Configuration: 5° Dish

Important Installation Notes:

• Requires Manley Bead Loc® valve locks — use P/N 13098-16 (7°) or 13153-16 (10°) depending on spring and retainer selection
• Manley intake stem size is .3133"; guide sizing and machine work may be required to achieve proper clearances
• All valve guides should be checked and correctly sized prior to installation

Manley Performance valves are crafted from severe-duty stainless steel and are engineered to withstand extreme combustion pressures, high temperatures, and aggressive cam profiles. With swirl-polished surfaces and hardened tips, these valves optimize power output and maintain exceptional reliability in naturally aspirated, forced-induction, and nitrous-fed applications.