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minneman

Question on I/O engine

5 posts in this topic

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

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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!!

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

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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.

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