I have a 250 L6 chevy.
I am replacing my cam-Crower-which went flat, with a new Crower. The cam/engine only has about 3 to 4000 miles on it. I broke the cam in as prescribed, it ran great for most of it's life until resently, I've pulled the cam and the engine needs rebuilding. A couple of machinist friends have pointed out that the new oils are made for roller lifters and catalitic converters (no Zinc in the oil). I could use Valvaline Racing oil, it has zinc - race cars have not cat.
My question is - should I spring for roller lifters? Or just stick with the flat and put in the racing oil. Does anyone know if GM EOS is still available?
It is a street car only, with a "RV" type cam, 80 over pistons, four barrel and headers. Otherwise it's stock, all new but stock.
