FED M311 LS3/LSA BOOST Monster Cylinder Heads
Engineered and Machined by FED in the USA.
Castings:
- 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
Options/Components:
- FED Billet Rocker Stands For Stock LS3 Rockers
- Severe Duty Intake valves
- Inconel Exhaust Valves
- 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
Sold as a Pair
