Question on I/O engine

[minneman]

I own a 30 year old I/O and was wondering if any of you knew how long it would take to damage the valve seats w/unleaded gas?

Or, what type of things would be happening if they were already damaged?

Ive only ran a tank threw it that I added lead additive to, but wondering if there was damage allready done pryor to my ownership, I believe its running ok, but I would like to do some trips with it next year and would like not having a breakdown, just curious?? thanks

[Valv]

Minneman, try to check this site with same question, they might be able to help you.

http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi

[CHODE]

we ran unleaded gas in our 1968 crestliner!
Chev 4 banger!!
Ran unleaded for 10 plus years with no problems!! New owner still is doing same with no problems!! I personally wouldnot worry about it!!

[Surface Tension]

I wouldnt worry about it either. Being 30 years old would worry me more. Use a lead additive if you like.

[Justfishing]

When unleaded came out the engine builders went to hardened valves. My guess is that it has hardened valves either when built or the heads were replaced.