Story of a swinger 340

I’m sure the light springs were great for breaking the cam in, though. For anyone wishing to look further into the spring specs, here’s the tfs link. They’re one of PAC’s “hot rod” springs.
Trick Flow Specialties TFS-16315-16 Trick Flow® by PAC Racing Dual Valve Springs | Trick Flow Specialties
But that’s definitely a great small block performance cam!