I just bought a 68 with a 289 - lead additive needed?

[garystocker]

do I need to add lead to this engine?

 

[Pbum5]

do I need to add lead to this engine?

It all depends.

If hardened valve seats were added when the heads were rebuilt you won’t need lead.

If not, then you will need a lead additive.

Find out from the engine builder. My guess is that they were added, but you’ll want to find out for sure.