E-CNC Gen III/IV LS Chevy Cylinder Head Small Port LSX Block

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Edelbrock part #61329 E-CNC LS3 Cylinder Heads are a great general-purpose high performance cylinder head for any street- strip LS engine.
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The Edelbrock #61329 E-CNC LS3 cylinder head is a great general-purpose high performance cylinder head for any street- strip LS engine. This cylinder head has a high velocity port compared to stock LS3 cylinder head, making them an ideal upgrade for any cathedral port or 3.89" bore LS application. They feature an improved design and casting that gives cylinder head porters more material to work with compared to another stock head. Like all of our other E-CNC cylinder head, these feature fully CNC'd intake ports, combustion chambers and exhaust ports for improved performance. Compatible with stock style rocker arms.

Documents & Installation Notes



Manufacturer Edelbrock
Application Application Specific
UPC 00085347613298
Series E-CNC
Grade Type Performance
Quantity Sold Individually
Camshaft Type Hydraulic Roller
CARB Executive Order Number D-215-98
Horsepower 450-550 HP
Availability Note Available to Order
Warranty 12 Months
Seat Angle Exhaust 39 deg/Intake 45 deg
Emissions Code
EO Number: D-215-98
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 Use 14mm x 17.5mm (.708”) reach tapered seat resistor type spark plugs. Heat range requirements will vary by application. For many applications, GM factory spark plugs or equivalent spark plugs such as Champion RS14YC6, NGK TR55, or Denso IT16 spark plugs may be used. Use anti-seize on the plug threads to prevent galling in the cylinder head, and torque to 10 ft./lbs. Do not over tighten sparkplugs! If a short reach plug is used, poor performance and possible engine damage may occur.
CNC Ported Yes
Combustion Chamber Volume 69 cc
Deck Height 9.240 in
Deck Thickness 0.625 in
Intake Valve Diameter 2.135 in
Exhaust Valve Diameter 1.55 in
Guide Plates Included No
Intake Runner Volume 260 cc
Material Aluminum
Push Rod Diameter 0.312 in
Valve Angle 13.25 deg
Valve Spring Diameter 1.30 in
Valve Spring Maximum Lift 0.680 in
Valve Stem Diameter 0.314961 in