Late 60s early 70s SBC are known to have bad cams that wore excessively.
That could be due to the phase out of zinc phospahte in our engine oils. All the new cars are coming with roller lifters, so the tyranical powers that be decided to screw the rest of us who prefer classic cars and trucks.
I've actually been using ZDDP additive along with Valvolines VR-1, but I didnt hear about this until 5 years after my engine rebuild, so the damage could have already been done.
If I do end up having to replace my cam and lifters, I'll be using Rhoads "Super Lube" lifters in combination with the zinc oil and additives I've been using.
