4000 RPM Governor Spring Kit with 12 Heavy Duty Valve Springs The Peak Diesel Governor Spring Kit is a special combination of Bosch springs and Piers' unique design on seats. This kit allows your engine to have full fueling to approximatey 4000RPM, which greatly improves the driving experience of a stock truck, for trucks with injectors and more, this kit is a must!
The GSK is designed to allow your pump to rev past factory settings without compromising pump safety.
4000RPM kits required use of heavy duty valve springs, which are included in this kit.
Fits 1994-1998 Dodge 12 Valve Cummins diesels.
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