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Victor Jr Gen III/ IV LS Chevy Cylinder Head LSX Block

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The Edelbrock #61349 Victor Jr. LS3 cylinder heads are ideal for use in high performance street and competition engines that have reached their limit with a stock-style cylinder head design. Most aftermarket LS3 cylinder heads on the market today are simply stock head designs with larger ports. Our Victor Jr. LS3 cylinder heads are an all-new ground up design that incorporates subtle changes for improved flow and combustion. These changes were made to improve the limitations encountered in the stock cylinder heads when increasing the performance level of the engine. Changes include a 2.20" diameter intake valve with a canted configuration similar to what is utilized in the GM LT1 Gen V engine. The intake valve change along with the unique port shape produce almost 400cfm peak flow. These cylinder heads also feature fully CNC™ intake ports, combustion chambers and exhaust ports for consistency and improved performance. All of these changes make these cylinder heads capable of producing 600+ hp on an LS3 engine with stock rocker arms, intake manifold and exhaust manifolds.

Documents & Installation Notes


Availability Available
Application Universal
GTIN 00085347613496
Availability Note Available to Order
Warranty 12 Months
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
  • For LSX Block
CNC Ported No
Combustion Chamber Volume 69.0 cc
Deck Height 9.240 in
Deck Thickness 0.625 in
Exhaust Valve Diameter 1.600 in
Guide Plates Included No
Intake Runner Volume 280.0 cc
Intake Valve Diameter 2.200 in
Material Aluminum
Push Rod Diameter 0.312 in
Valve Angle 11 deg
Valve Spring Diameter 1.300 in
Valve Spring Maximum Lift 0.680 in
Valve Stem Diameter 0.313 in