4000 RPM Governor Spring Kit (4K GSK)The Peak Diesel Governor Spring Kit is a special combination of springs and Piers' unique design on seats.This kit allows your engine to have full fueling to approximately 4000RPM, which greatly improves the driving experience of a stock truck, for trucks with in..
BILLET/TITANIUM VALVE SPRING RETAINERS & HARDENED KEEPERS
Dodge 1989-1998 5.9L 12 Valve Cummins
We highly recommend the use of titanium valve spring retainers & hardened keepers when exceeding 3500RPM with your 12 Valve Cummins, especially those with HD valve springs.Retainers are made of ..
180 lb 12v Dual Valve Springs with retainers & keepers
Billet 10° retainers, and correct style Cummins locks
180 lb seat pressure
Requires spring seat and seal modification (can be done with hand drill).
Tooling/valve seals available..