F-Series Cylinder Heads

Call 817.556.2434 for pricing & to place your order!

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Heads are complete and assembled. Valve covers, oil fill cap, and doweled rocker stands included with purchase of heads.

All F-series:

  • 100% designed, tooled, cast and machined in the USA.
  • A357 T6 Aluminum Castings – T6 heat treated, low silica alloy. Similar in strength, machinability and weldability to 6061-T6 billet. Superior strength compared to all commercially available castings. 20% stronger than similar high-end castings made from A356. A357 is the same material used in most aftermarket engine blocks along with many cast aerospace components.
  • 0.750” deck structure, thicker than all stock and most aftermarket castings.
  • High efficiency water jacket – by increasing efficiency the overall water jacket has been reduced for overall strength without sacrificing cooling ability for all applications including endurance racing.
  • Raised runner design on both intake and exhaust – Raised runner design allows for more efficient cylinder filling, better high-rpm operation without sacrificing low and mid-range performance. Greater flow characteristics, especially when combined with our shallow valve angles. Intake flange is extended to allow all standard manifolds to fit without modification.
  • Exhaust port exit is on center with valve – Substantially better flow characteristics. Bolt pattern moved to accommodate all standard header designs using 1-7/8” or larger headers.
  • Proprietary valve cover design – Enlarged valve cover based loosely on a SB2 pattern allows for more rocker clearance when using solid rollers, more spring clearance for larger diameter/higher lift packages. Valve covers included with purchase of heads. See valve cover section below for additional information. Valve covers are doweled and o-ringed for superior sealing and serviceability.
  •  ¼” NPT water crossover ports – Better cooling capacity and more flexible installation/plumbing options.
  • Cathedral port.
  • 10 and 12.8 degree inline valve angle configurations ideal for everything from naturally aspirated to supercharger, turbo, and nitrous applications.
  • Port volume:
  • Chamber volume:
  • Peak flow:
  • Standard versions designed to work with GM LS3 rockers and equivalent.
  • Solid stainless 2.135″ intake valve.
  • Solid stainless 1.615″ exhaust valve.
  • Interlocking valve seats (like those found in racing heads) standard.
  • Accommodates up to 3/8″ straight pushrods. See rocker section for solid roller applications.
  • 4.030″ minimum bore size (can be run on slightly smaller bores with proper head gasket).
  • Standard FED .660″ lift spring kit with titanium retainer (upgrade options available).
  • Rectangle port based on GM LS3.
  • 10 and 12.8 degree inline valve angle configurations ideal for everything from naturally aspirated to supercharger, turbo, and nitrous applications.
  • Port volume:
  • Chamber volume:
  • Peak flow:
  • Standard versions designed to work with GM LS3 rockers and equivalent.
  • Solid stainless 2.175″ intake valve.
  • Solid stainless 1.615″ exhaust valve.
  • Interlocking valve seats (like those found in racing heads) standard.
  • Accommodates up to 3/8″ straight pushrods. See rocker section for solid roller applications.
  • 4.065″ minimum bore size (can be run on slightly smaller bores with proper head gasket).
  • Standard FED .660″ lift spring kit with titanium retainer (upgrade options available).
  • Rectangle port based on GM LS7.
  • 10 degree – small, efficient, and easily tune-able combustion chambers. Suitable for N/A and turbo/supercharged applications.
  • 2.250″ intake valves.
  • 1.615″ exhaust valves.
  • 15 degree – designed for True Street / Ultra Street and multi-kit nitrous applications.
  • 2.200″ intake valves.
  • 1.650″ exhaust valves.
  • Port volume:
  • Chamber volume:
  • Peak flow:
  • Standard versions designed to work with GM LS3 rockers and equivalent.
  • Interlocking valve seats (like those found in racing heads) standard.
  • Accommodates up to 3/8″ straight pushrods. See rocker section for solid roller applications.
  • 4.125″ minimum bore size (can be run on slightly smaller bores with proper head gasket).
  • Standard FED .660″ lift spring kit with titanium retainer (upgrade options available).
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