I am rebuilding a 1971 toyota 8 rc engine what to do to run unleaded fuel in it?

[Dale]

what do i need to change in the valve train or do ineed to change anything please advise

 

[pedro7of9]

get hardened valve seats...if your already getting a valve job it will come with them

 

[LeAnne]

Hardened valve seats and valves and valve guides.
On an older engine run on unleaded fuel, the exhaust valves will literally wear the seats so badly that the valves will recede up into the heads and the guides will wear excessively.
Once the head is properly overhauled, it will provide you with reliable service for many, many miles.

 

[Wes]

You will need coated valves. Try typing your question in your address bar to seek links.