Yella Terra YT 6667 Ultralite Roller-Tip Rocker Arm Kit for GM LS-Series, 1.70 Ratio

Upgrade your GM LS-series valvetrain with the Yella Terra YT 6667 Ultralite rocker arm kit. Designed for LS3 applications, this shaft-mount rocker arm assembly uses a 1.70:1 ratio to optimize valve lift and improve valvetrain performance. The non-adjustable configuration simplifies installation while maintaining dependable rocker arm geometry for performance-focused street, track, and competition engines.

Each rocker arm features a roller tip that helps reduce friction at the valve interface, supporting smoother operation and reduced wear. The lightweight aluminum construction helps minimize valvetrain mass, allowing improved high-rpm control when matched with compatible camshaft, valve spring, and cylinder head components. The shaft-mount design also provides stable rocker positioning and consistent operation across the valve train.

The Yella Terra YT 6667 kit is engineered for GM LS-series engines and is intended for builders seeking a durable, performance-oriented rocker arm solution. Verify cylinder head compatibility, valve lift requirements, pushrod length, and spring clearance before installation. Proper setup is essential to achieve correct rocker geometry and reliable engine operation. This kit is supplied as a complete rocker arm assembly for the specified application and ratio.

Features:

• Brand: Yella Terra

• Part Number: YT 6667

• Application: GM LS-series and LS3 engines

• Rocker Arm Type: Ultralite shaft-mount design

• Ratio: 1.70:1

• Tip Style: Roller tip for reduced valve-interface friction

• Material: Lightweight aluminum construction

• Adjustment: Non-adjustable configuration

• Kit Type: Complete rocker arm kit

• Use: Performance street, track, and competition applications