Frankenstein LSA/LS3 M311 6 Bolt Heads

$ 3,295.00

  • Engineered and Machined by FED in the USA.

  • Price listed is for the pair
    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
    • 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