F110 - LS1 250cc 4.030" Cylinder Heads

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Set of two (2) LS1 cathedral port cylinder heads. Heads are complete and assembled. Valve covers, oil fill cap, and doweled rocker stands included with purchase.

  • 10° valve angle
  • 250cc
  • Solid, stainless 2.135” intake / 1.615” exhaust valves
  • 4.030” minimum bore size
  • FED titanium 0.660” lift Spring Kit
  •  ¼” NPT water crossover ports
  • 100% Designed, Tooled, Cast and Machined in the USA.
  • A357 T6 Aluminum Castings – T6 heat treated, low silica alloy. Similar in strength, machine-ability and weld-ability 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.

F110:

  • 10° inline valve angle configuration ideal for everything from naturally aspirated to supercharger, turbo, and nitrous applications.
  • Port & Chamber volumes / flow numbers TBD.
  • Standard versions designed to work with GM LS3 rockers and equivalent. Doweled rocker stands included with head purchase.
  • Solid, stainless 2.135” Intake / 1.615” Exhaust valves standard – interlocking valve seats (like those found in racing heads) standard.
  • Accommodates up to 3/8” straight pushrods. See Rocker section for information on solid roller applications.
  • 4.030” minimum bore size (can be run on slightly smaller bores with proper head gasket).
  • Includes FED Titanium 0.660” lift Spring Kit.

Valve Covers:

  • 319 aluminum alloy cast valve covers – same alloy used in most aftermarket and stock cylinder head castings.
  • Baffled vent section – Compatible with stock PCV/emissions components.
  • -16AN ORB Oil Fill cap included.
  • Built in coil mounts.
  • Available in bare and powder coated finishes. Fully machined versions available upon request.

Solid Roller Options:

  • All F-Series cylinder heads available with shaft-mount, roller tip rockers.
  • Available for on-center and 0.180” offset lifters.
  • Solid roller heads will accommodate up to a ½” pushrod.
  • Crower to offer F-Series shaft-mount rockers as standard catalog item.

 

California Residents:

Proposition 65. This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

! WARNING: Cancer and Reproductive Harm – www.p65Warnings.ca.gov

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