VW 1.25 Ratio Forged Rocker Arms - Bolt-On Horsepower Upgrade - 21-2312-0

One of the most cost-effective ways to wake up a stock or mild air-cooled engine is to increase the valve lift without the labor of a full camshaft swap. These forged rockers are the "bolt-on horsepower" solution for the weekend mechanic, providing a noticeable bump in mid-range pull and top-end breathing while maintaining your engine's drivability.

1.25 Ratio Forged Rocker Arm Set – High-Lift Performance Upgrade

Unlock more power and improved acceleration from your Volkswagen engine with this high-precision 1.25 ratio rocker arm set. Designed to replace your factory 1.1:1 rockers, these 1.25 units increase total valve lift by approximately 13%, allowing your engine to pull in more air and fuel for better combustion and exhaust scavenging.

Forged from high-grade steel for maximum strength and durability, these rockers are engineered to withstand higher RPMs and increased valvetrain stress. Because they do not change the duration of your camshaft, you get the benefit of increased lift without sacrificing bottom-end torque or smooth idling. This makes them a perfect upgrade for street-driven Beetles, Buses, and Ghis still running stock or mild carburetors.

Product Specifications & Features

• Ratio: 1.25:1 (Increases valve lift over stock 1.1:1).

• Construction: Forged Steel for superior structural integrity and wear resistance.

• Compatibility: Designed to work with stock rocker shafts, pushrods, and adjusters.

• Installation: True bolt-on upgrade; no machining or case splitting required.

• Versatility: Compatible with stock carburetors and ignition systems.

Vehicle & Engine Fitment

Fits all upright air-cooled Type 1 based engines:

• Engine Displacement: 1200cc, 1300cc, 1500cc, and 1600cc.

• VW Type 1: Beetle, Karmann Ghia, Thing (1954–1979).

• VW Type 2: Bus / Transporter (up to 1971).

• VW Type 3: Notchback, Squareback, Fastback (1962–1973).

Tech Tip: While these work with stock hardware, we highly recommend pairing them with a set of Swivel Foot Adjusters and Bolt-On Rocker Shafts to maximize reliability and simplify valve adjustments. Always check your valve-to-piston clearance and coil bind when increasing lift.