Re: Hardened valve seats or lead additive...

Posted by JWL On 2012/11/28 10:56:11

D-train, Craig's comments were mostly about the V-8s, which can have valve troubles with the new fuels if driven at more than moderate speeds. He posted a very interesting graph depicting speed v wear. It is worth viewing if you can find it here. You should be fine with no hardened seats and regular grade modern gas. Get a good precision valve job with care to how the valves fit in the guides. The S-8s are low stressed in the valve area as compare to the V-8s. Good luck either way.

(o[]o)

Added comment: You should not have any need for lead additives or supplements. The big problem with modern fuels and the vintage S-8s is vapor lock in warm weather.