* Reduced EMI/RFI Interference: Big-block Chevys, with their high voltage ignition systems, can generate significant electromagnetic and radio frequency interference. Shields help contain this interference, preventing issues with electronic components like the engine control unit (ECU), radio, and other sensitive electronics.
* Improved Ignition Performance: Shields help maintain a stronger spark by preventing stray voltage from leaking away. This can lead to better combustion and potentially more power.
* Safety: Shields provide a layer of protection, reducing the risk of accidental shocks from high-voltage components.
While a stock, low-power big-block might function without them, the benefits of using spark plug shields greatly outweigh the minimal cost and effort of installation, especially if you're modifying the engine for increased performance or have sensitive electronics. It's a good preventative measure.
