Oil and Gas additives

[EMCD]

Do i need to add anyhting to my oil or gas to make my '72 cuda 340 run better? I hear new oil doesn't contain zinc and is rough on the cam and that lead additive keeps the engine from getting too hot. Any merit to those items?

 

[burntorange70]

Unless you are running a big cam with a lot of spring pressure the zinc thing is not a big deal. I have never put any additives in my stock 70 340 at all and have had it sence 1991. Would be a little extra insurance though and could not hurt.

 

[EMCD]

ok, i thought since the car was produced b4 unleaded, that it would run hotter. any truth to that statement?

 

[burntorange70]

Installing hardened valve seats is the best way to go. Thats what I did last time I had my heads off.