Victor Jr. LS3

  • Cylinder Head Specifications:
  • Combustion chamber volume: 69cc
  • Intake runner volume: 280cc
  • Exhaust runner volume: 85cc
  • Intake valve diameter: 2.20"
  • Exhaust valve diameter: 1.60"
  • Valve stem diameter: 8mm
  • Valve guides: Manganese bronze
  • Deck thickness: 5/8"
  • Valve spring diameter: 1.30"
  • Valve spring maximum lift: .680"
  • Rocker stud: N/A
  • Guideplate: N/A
  • Pushrod diameter: 5/16"
  • Valve angle: 11°x3° Intake | 11°x0° Exhaust
  • Exhaust port location: +.125
  • Spark plug fitment: 14mm x 3/4 reach, gasket seat
The Edelbrock 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’d 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.
  Complete (Single)
Application Dyno Emissions Satin
Victor Jr. LS3 (4-bolt flange) - 61339
Victor Jr. LS3 (6-bolt flange) - 61349
Edelbrock Installation Note INSTALLATION NOTE:
#61339: Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
Valve Lift .200" .300" .400" .500" .600" .700" .800" .900" .1000"
Intake 131 197 260 315 354 381 390 390 388
Exhaust 107 147 184 216 233 241 245 247 249
Edelbrock Tech Note TECH NOTE: Please view Cylinder Head Flow Data and Valve Springs & Retainers for all Edelbrock Performance Aluminum Cylinder Heads.
The following guide is designed to help you determine which Edelbrock components are legal for use on your vehicle. Learn more about Edelbrock Product Emissions Guide.

    50-State Legal
    For Racing Use ONLY
    For Use on Pre-Pollution Controlled Vehicles (PPCV)
    Stock Replacement Part
    Engine Swaps