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(16) Ultra Pro Magnum™ Roller Rockers - Stud Mount - GM LS3/L99/L76/Rectangle Port Heads


COMP Cams® Rockers

In stock
  • For LS3/L99/L76 - Rectangle Port Head LS Applications
  • Set Of 16 Stud Mount Rockers - Includes Poly Locks - Requires 3/8" Studs & Guide Plates
  • 1.8:1 Ratio

New LS-Specific Ultra Pro Magnum™ Rocker Arms From COMP Cams® Increase Ratio And Stiffness Over Stock Rockers, While Also Increasing Lift Without The Need To Swap Cams

As LS engines continue to grow in popularity, COMP Cams® has expanded its line of rocker arms to build components specific to LS applications. New Ultra Pro Magnum™ Rockers are made from investment-cast 8650 chromemoly steel, utilize upgraded trunnions and needle bearings over stock and are stronger, stiffer and more durable than the stock parts. They also feature a 1.8 ratio (compared to the stock rockers’ 1.7) and utilize a roller tip instead of a slider. The higher ratio and increased stiffness make these rockers a great option for increasing lift without changing cams. This increased stiffness, along with the upgraded trunnion package and roller wheel, also makes them a perfect choice when running aftermarket valve springs. The rockers are available in a bolt-down design that uses stock rocker stands and in a stud-mount option for customers looking for an adjustable valve train. The stud-mount version is perfect for individuals running mechanical lifters as well. COMP Cams® LS Ultra Pro Mangum™ Rockers Arms are available for LS1, LS2, LS3, LS6 and LS-based truck engines and come in individual sets or kits featuring studs and guide plates. Kits do not include pushrods, but they are available separately.

  • Increased (1.8) ratio & stiffness make rockers a great option for increasing lift w/o changing cams
  • Investment-cast 8650 chromemoly steel body creates components stronger, stiffer & more durable than stock 
  • Increased stiffness, upgraded trunnion & roller wheel make rockers  perfect for aftermarket valve springs
  • Two designs available – bolt-down using stock rocker stands & and stud-mount for adjustable valve trains
  • Available in individual sets or  kits for  LS1, LS2, LS3, LS6 & LS-based truck applications 
  • Limited Lifetime Warranty - So strong that we guarantee the rocker bodies against breakage for life. For use with up to 850 lbs of open spring pressure!
 Ultra Pro Magnum™ GM LS Rockers Part #
 LS3 - Rectangle Port Heads 
Ultra Pro Magnum™ GM LS Rockers (16) - Bolt-Down1678-16
Ultra Pro Magnum™ GM LS Rockers (16) - Stud Mount-
Ultra Pro Magnum™ GM LS Rockers (16) - Stud Mount Kit w/ Studs & Guide Plates   16765-KIT  
 LS1/LS2/LS6 - Cathedral Port Heads 
Ultra Pro Magnum™ GM LS Rockers (16) - Bolt-Down1677-16
Ultra Pro Magnum™ GM LS Rockers (16) - Stud Mount1675-16
Ultra Pro Magnum™ GM LS Rockers (16) - Stud Mount Kit w/ Studs & Guide Plates    16755-KIT 
More Information
UPC 036584213703
Manufacturer COMP Cams®
Emissions Code
Rocker Arm Ratio 1.8