Description
Shim Overview:
The Nova Engines .21 Engine Underhead Shim is a must-have tuning component for racers looking to fine-tune their engine performance. Designed for precision adjustments, this shim allows you to optimize combustion characteristics based on your specific setup.
About the Shims
Precision Engine Tuning Control
Underhead shims play a critical role in adjusting engine compression, allowing you to dial in performance for maximum efficiency and power. By adding or removing shims, you can adapt your engine to suit temperature changes, humidity levels, and nitro content, helping maintain consistent performance. Built for .21 engines, this shim ensures a precise fit and reliable sealing, making it an effective and simple way to optimize your engine’s output.
Features:
- Designed for .21 nitro engines
- Enables precise compression tuning
- Adapts to weather and track conditions
- Optimizes performance for different nitro percentages
- Thin and lightweight design
- Ensures proper engine sealing






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