E-CNC Big-Block Chevy Rectangle Port Cylinder Head Hydraulic Roller

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The Edelbrock part #79559 Big Block Chevy E-CNC 355 cylinder head is the ultimate in performance. This cylinder head is fully CNC ported for maximum horsepower and torque, making them ideal for high-performance's street and light duty racing applications. They also feature high-quality lightweight valve springs and heavy duty hardware for maximum lift and maintain the stock exhaust port location. E-CNC 355 FOR B/B CHEVY (RECTANGLE PORT) FEATURES: - This cylinder head delivers maximum horsepower and torque in high Performance's street and light duty racing applications - Full CNC porting of the combustion chambers, intake & exhaust runners; improving air-flow & overall performance potential - This head has a 24.5deg x 4.4deg intake valve angle, 15.5deg x 4.2deg exhaust valve angle and exhaust ports that have been raised 0.125" but are still in the stock location - Spark plug angles have been modified to produce a smooth flame front for increased fuel efficiency & maximum power - combustion chamber size of 118cc - Equipped with valve springs for use in hydraulic roller applications

Documents & Installation Notes


Availability Available
Application Application Specific
UPC 00085347795550
Ech Ival Dia 2.30 in
Series E-CNC
Grade Type Performance
Quantity Sold Individually
Guide Plate Material Hardened Steel
Camshaft Type Hydraulic Roller
Horsepower 550-750 HP
Availability Note Available to Order
Warranty 12 Months
Seat Angle Exhaust 45 deg/Intake 45 deg
Emissions Code
Hazardous Materials Warning WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • Match with Edelbrock head gasket sets . Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
CNC Ported Yes
Combustion Chamber Volume 118 cc
Deck Height 9.8 in
Deck Thickness 0.625 in
Exhaust Valve Diameter 1.88 in
Guide Plates Included Yes
Intake Runner Volume 354-334 cc
Material Aluminum
Push Rod Diameter (Suggested) 0.375 in
Rocker Stud Diameter 0.4375 in
Valve Angle Exhaust 15.5 X 4.2 deg/Intake 24.5 x 4.4 deg
Valve Spring Diameter 1.55 in
Valve Spring Maximum Lift 0.700 in
Valve Stem Diameter 0.3438 in