Optimize your engine's operation to get more responsive power
PacPro offers a wide variety of spring kits for all applications of 6BT & 4BT Cummins engines. Whether you are installing an exhaust brake or governor spring kits we have the kit for you.
Heavy duty valve springs are Cummins OEM 3916691 white strip springs. The 60 lbs spring is required for exhaust brake applications and is suggested for all governor spring installs.
Governor spring kits allow the Bosch P7100 to spin the engine RPM up to 4000 RPM. Each kit comes complete with parts for either 3000 or 4000 RPM. PacPro’s governor spring kits are recommended for vehicles that have 5 speed standard transmissions. They are perfect for those who tow heavy loads and want more responsive power.