Re: Hardened valve seats or lead additive...

Posted by Rusty O\'Toole On 2012/11/29 21:41:38

When the 327 straight eight was designed gas was low lead, low octane. It should run on today's regular gas with no problems.

The only possible exception would be, the last year or 2 of production when they had over 8:1 compression. One of those might run better on hi test. You would have to try them and compare, if the engine runs well and does not knock on regular there is no advantage to using hi test.

Hardened valve seats should not be necessary.

If you like, you can add some upper cylinder oil to the gas. Redex, Bardahl, or your favorite brand. It can't hurt especially for hiway driving on a hot day.