CFE 11 Degree

Spreadport BBC

Oval Intake Port Programs engineered for small displacement engines (less than 600 c.i.d.) including manifold specific port programs for engine builders who are confined to a particular manifold selection. These ports are designed to maximize horsepower when used in combination with either a single carburetor with a cast manifold or two carburetors with a fabricated manifold.

Square Port Programs designed for large displacement engines (over 600 c.i.d.). CFE fabricated manifold is recommended.

Cylinder Head Specifics

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Intake Valve Diameter:As large as 2.520"
Exhaust Valve Diameter:As large as 1.860"
Chamber Volume:87cc. Chamber can be machined to approximately 65cc in most situations. The CNC program for the combustion chamber is based on a 4.600? bore diameter. Custom chamber programs for use with smaller bore diameters are available upon request for an additional charge.
Seats:Available with ductile iron or alloy seats.
Guides:11/32" valve guides are standard, 5/16" guides are available upon request. Alloy guides are standard, steel guides are available upon request and are recommended for boosted applications.
Exhaust Flange:Uses a standard Big Block Chevy header/exhaust flange.
Cooling Provisions:The CFE 11 degree Spread-Port head has cooling provisions on the intake flange.

Cylinder Head Requirements

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Minimum Bore:4.600"
Intake Manifold:Cast 1x4500 manifolds available for 9.800 and 10.200 deck heights. CFE fabricated manifolds available for various applications.
Exhaust Lifters:Qty 8 @ on-center
Valve Cover:Uses a standard Big Chief valve cover and valve cover gasket.
Shaft Rocker System (required)
Head Stud Part Number:235-4312
Spark Plug:3/4" reach gasketed spark plug
Assembly Components:Call for details

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