CMI Precision Billet Roller Rocker Arm Kit — 1.4:1 Ratio | Air-Cooled VW

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CMI Precision Billet Roller Rocker Arm Kits

Race-Proven Engineering for the Ultimate VW Valvetrain.

The all-new 2025 CMI Precision Billet Roller Rockers are the most advanced assemblies on the market. Extensively track-tested by elite drag racing teams, these kits are engineered to handle extreme lift and high RPM while keeping your valvetrain cool and lubricated.

Advanced Forced-Fed Lubrication

The 2025 design features a revolutionary oiling system: oil is force-fed through the pushrods to the DLC-coated shafts and sprayed directly onto the roller tips. This constant oil bath reduces friction and provides critical cooling to the valve springs, ensuring maximum performance through the lights.

Premium Materials & Construction

• Rocker Arms: Machined from 7050-T651 Aluminum, hard-anodized with a Teflon seal for superior durability.

• Rocker Shafts: High-strength 9310 Steel with a Diamond-Like Carbon (DLC) coating for near-zero friction.

• Hardware: 3/8" H13 Tool Steel adjusting screws with ball cups and Titanium 12-point lock nuts.

• Mounting: Rocker assemblies are secured with Grade 12.9 studs and 7075-T651 aluminum blocks for rock-solid stability.

Ratio Identification

For easy identification, CMI uses color-coded anodized end caps:

• Blue End Caps: 1.4:1 Ratio

• Black End Caps: 1.5:1 Ratio

Technical Specs at a Glance

• Rocker Body: 7050-T651 Aluminum (Hard Anodized)

• Shaft Material: DLC-Coated 9310 Steel

• Adjusters: H13 Tool Steel with Titanium Lock Nuts

• Blocks & Spacers: Black Anodized 7075-T651 Aluminum

• Mounting Studs: Grade 12.9