Empi 21-2312 1.25 Ratio Forged Rocker Arms, Set Of 8 Forged For Strength And Durability, These Ratio Rocker Arms Provide An Easy And Inexpensive Way To Get More Power And Acceleration From Any Aircooled 1600cc Based Engine. No Special Modifications Are Needed, The 1.25s Will Work With Stock Rocker Shafts, Push Rods, And Adjusters. Or With Hi-Performance Bolt On Rocker Shafts And Swivel Foot Adjusters. The 1.25 Rocker Arms Will Not Affect Cam Duration, Bottom End Performance, Or Reliability. The 1.25 Rocker Arms Will Affect The Lift Of Your Cam, So Check Your Cam Specifications With The Manufacturer. They Can Be Run With Stock Engine Components And Carburetors. These Are Easy To Install With Minimal Hand Tools. Additional Parts And Gaskets May Be Required. Fits Aircooled 1600cc Based Engines In Volkswagen Beetles, Karmann Ghia, Notchback, Fastback, And Squareback, Bus, Thing, Manx, Sandrails, Kit Cars, and Dune Buggys.