Yella Terra YT 6670 GM LS-Series Ultralite Shaft-Mount Rocker Arm Kit, 1.80 Ratio

Upgrade your GM LS-series valvetrain with the Yella Terra YT 6670 Ultralite Shaft-Mount Rocker Arm Kit. Designed for LS7 applications, this complete rocker arm solution combines a lightweight aluminum construction with a precise 1.80:1 rocker ratio to support improved valvetrain performance and reliable operation in performance-focused engines.

Each rocker arm features a roller tip that helps reduce friction at the valve stem while promoting consistent contact through the rocker arm’s operating range. The shaft-mount design provides stable rocker arm alignment and helps maintain accurate geometry under demanding engine conditions. The Ultralite construction reduces unnecessary valvetrain mass without sacrificing the strength required for high-performance use.

The Yella Terra YT 6670 kit is engineered for GM LS-series cylinder heads and is a practical choice for builders seeking dependable shaft-mounted rocker arms with a higher ratio. A 1.80 ratio can increase valve lift when matched with the appropriate camshaft and valve spring package, making proper valvetrain setup essential. Verify cylinder head, camshaft, pushrod, spring, and retainer compatibility before installation.

Designed for performance engine applications, this Yella Terra rocker arm kit delivers precise operation, reduced friction, and durable aluminum construction in a dedicated LS7-compatible package. It is supplied as a kit for streamlined installation and is suitable for engines where accurate rocker geometry and consistent valve control are priorities.

Features:

• Brand: Yella Terra
• Part Number: YT 6670
• Application: GM LS-series and LS7 performance engines
• Design: Ultralite shaft-mount rocker arm kit
• Rocker Ratio: 1.80:1
• Tip Style: Roller tip for reduced friction and consistent valve contact
• Material: Lightweight aluminum construction
• Use: Performance-oriented valvetrain upgrades
• Fitment: Verify compatibility with cylinder heads, camshaft, pushrods, valve springs, and retainers before installation