[skiznod]

what exactly do i need to do to some old 302 heads, so that they are able to run on unleaded gas? All the details please?

 

[mustangzrule]

See the thread about hardened valve seats.

You may have to read a lot, but it will help you decide if you need to do anything at all. It seems to be up to the individual at this point. Personally, I'd do the seats.

 

[Robbi]

Would rotator retainers help?

I heard about "the rotator retainers on the exhaust-valves would help and the valve seats would hold longer time "

 

[n2omike]

Those 'rotator' retainers hold the valves loosely, allowing them to rotate for more even wear.

The downside, is they hold the valves LOOSELY. They are fine for stock cam profiles, but are not recommended for high performance cams and stiff springs.

Good Luck!