FED M311 LS3/LSA Monster Cylinder Heads
FED M311 LS3/LSA Monster Cylinder Heads

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FED M311 LS3/LSA Monster Cylinder Heads

Engineered and Machined by FED in the USA.

  • 6 Bolt Head
  • 0.750″ Deck Structure
  • OEM/Factory Style Water Crossover Ports
  • 7/16″ Stud Size For Main 10 Bolts
  • 8mm Stud Size For Outer Tabs and Deck Studs

Their Process:

  • 5-Axis CNC Ported Intake Ports, Exhaust Ports, and Combustion Chambers
  • Precision 5-Angle CNC Valve Job
  • PCD Deck Milled
  • Hand Blended and Deburred
  • Final Wash
  • Final Assembly with Spring Heights Checked
  • Quality Control at every stage of manufacturing


  • FED Billet Rocker Stands For Stock LS3 Rockers
  • Intake Valve Guides – Bronze
  • Exhaust Valve Guides – Bronze
  • Manley Polished Nextek HP Dual Spring 1.295″ 155# @ 1.800/405# @1.150/.660 lift (Hydraulic)
  • FED Titanium Retainers
  • ¼ x ½ Dowel Pin – Rocker Stand Dowel Pins
  • Exhaust Port Silicone O–Rings
  • Intake Valve Seats – Ductile Iron
  • Exhaust Valve Seats – Ductile Iron
  • FED Steel Valve Spring Locators – .565 Guide
  • Stock Style 7° Valve Locks
  • US Seal Viton High Heat Valve Stem Seals
  • US Seal Hardened Spring Shims

List Price: $2,400.00

Product Code: FEDM311

Billet Rocker Rails:


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