COMP Cams · New
COMP Cams Rocker Arm GM LS3 1.8 Bolt Do
MPN 1678-1 · Store SKU cca1678-1
Supplier stock checked 11/7/2026, 1:31:45 PM UTC. Adding a part does not reserve it.
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Product details
New LS-Specific Ultra Pro Magnumâ„¢ 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. For LS3/L99/L76 - Rectangle Port Head LS Applications Single Bolt Down Rocker - Includes Bolt 1.8:1 Ratio This Ultra Pro Magnum rocker is made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. Featuring a 1.8 ratio, this rocker fits non-adjustable pedestal mount LS3. Ultra Pro Magnum 1.8 Ratio Rocker Arm for Pedestal Mount GM LS3
Manufacturer fitment & guides
Check 1678-1 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
