CFE 18 DEGREE SPREAD-PORT

4.840 BORE SPACED | BBC | SPREAD-PORT

Standard 18-degree Spread-port programs are available in both rectangular and oval port configurations depending on engine requirements. CFE 18-degree Spread-port programs are custom-engineered for both engine application and manifold requirements.

The 18-degree Spread-port head is recommended specifically for nitrous oxide applications as it promotes efficient atomization of the air-fuel mixture thus broadening the tuning window of the engine by making it less prone to detonation. Also, the larger combustion chamber typical of the 18-degree Spread-port head makes it desirable for applications that require less compression ratio such as turbocharged and blown engines.

Popular Applications Include: Successfully used in Top Sportsman, Top Dragster, heads-up street car racing, bracket racing, off-shore marine, blown alcohol, drag boats, tractor pulling, mud racing, and turbo-charged applications.

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Cylinder Head Specifics
Intake Valve Diameter:	As large as 2.400″
Exhaust Valve Diameter:	As large as 1.900″
Chamber Volume:	95cc @ 4.500 Bore, 97cc @ 4.600 Bore
Seats:	Available with ductile iron or alloy seats.
Guides:	11/32″ valve guides are standard, Alloy guides are standard, steel guides are available upon request and are recommended for boosted applications.
Exhaust Flange:	Accepts a standard Big Block Chevy header.
Cooling Provisions:	The CFE 18 degree Spread-Port head has cooling provisions on the intake flange.

Cylinder Head Requirements
Intake Manifold:	Cast single dominator or tunnel ram manifolds are available for 9.800 or 10.200 deck heights.
Exhaust Lifters:	Qty 8 @ on-center
Valve Cover:	Requires a standard Big Chief valve cover and valve cover gasket.
Shaft Rocker System (required)
Jesel:	KPS-23097
T&D:	3036
Head Stud Part Number:	235-4312
Spark Plug:	3/4″ reach gasketed spark plug
Assembly Components:	Call for details