CMI Precision Billet Roller Rocker Arm Kit — 1.5:1 Ratio | Air-Cooled VW

CMI Precision Billet Roller Rocker Arm Kit — 1.5:1 Ratio | Air-Cooled VWMore rocker ratio means more valve lift from the same cam and CMI's 1. 5: 1 billet roller kit delivers it with race proven hardware. This is the track tested 2025 assembly with forced feed oiling and DLC coated shafts, engineered to survive extreme lift and high RPM while keeping the valvetrain cool. The 1. 5: 1 ratio is identified by black anodized end caps. Features 1. 5: 1 rocker ratio (black anodized end caps) Forced feed oiling oil routed through

More rocker ratio means more valve lift from the same cam — and CMI's 1.5:1 billet roller kit delivers it with race-proven hardware. This is the track-tested 2025 assembly with forced-feed oiling and DLC-coated shafts, engineered to survive extreme lift and high RPM while keeping the valvetrain cool. The 1.5:1 ratio is identified by black anodized end caps.

Features

• 1.5:1 rocker ratio (black anodized end caps)
• Forced-feed oiling — oil routed through the pushrods to the shafts and sprayed onto the roller tips
• Rocker arms machined from 7050-T651 aluminum, hard-anodized with Teflon seal
• 9310 steel shafts with Diamond-Like Carbon (DLC) low-friction coating
• 3/8" H13 tool steel adjusters with ball cups and titanium 12-point lock nuts
• Grade 12.9 mounting studs with 7075-T651 aluminum blocks and spacers
• Constant oil bath cools the valve springs and reduces friction at high RPM

Specifications

• Ratio: 1.5:1
• Rocker body: 7050-T651 aluminum, hard anodized
• Shaft: DLC-coated 9310 steel
• Adjusters: H13 tool steel with titanium lock nuts
• Blocks & spacers: black anodized 7075-T651 aluminum
• Mounting studs: Grade 12.9

Fitment

CONFIRMED: VW Type 1 air-cooled engines — Beetle, Bus, Karmann Ghia, Type 3, Thing — in performance and racing builds running high-lift cams. The 1.5:1 ratio increases effective valve lift, so verify rocker geometry, pushrod length, retainer-to-guide clearance, and coil bind for your specific cam and head combination. NOT CONFIRMED: Type 4 engines.

Questions & Answers

What ratio is this kit? 1.5:1, identified by black anodized end caps. The 1.4:1 version has blue caps.

What does the higher ratio do? It increases effective valve lift over a 1.4:1 or stock 1.1:1 rocker, for more flow from the same cam.

How does the oiling work? Oil is force-fed through the pushrods to the DLC shafts and sprayed onto the roller tips for constant cooling and low friction.

Will these fit my build? They fit Type 1 engines; with the added lift, verify geometry, pushrod length, and clearances carefully.

Is this a CMI product? Yes — CMI Precision, sold by Washburn's Metal.

Prop 65 Warning

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.