Genuine Cummins 3916691 60lb over valve springs.
Set of 12 for both intake and exhaust valves.
You will need these when you install an engine brake or high rpm injection pump springs.
Also known as 60lb over stock HD Valve Springs or 60# over HD Valve Springs
These heavy duty exhaust valve springs are required if you plan on running any exhaust brake or higher than stock rpm and or higher boost. Completely safe spring pressures, even for stock running components.
The seat pressure on these springs is ~150 lbs at the installed height.
Cam nose pressure at 1.4″ is 145 lbs.
If you have a mechanical 4bt or 6bt and are going to install an exhaust brake or turn over 3700rpm or run over 40lbs of boost , your stock valves won’t be strong enough to effectively hold the valves closed.
Don’t be fooled by people selling cheap springs out there. A broken spring can take out an engine………..
