darenGR wrote:
Many thanks for your reply, Ray.
This is engine is a bit larger, produces around 270-275 HP. I wonder
what fuel do people use on all those gas engines around 1988-89, where
unleaded started to become common. THis 350ci block was in production
from 1987 to 1995 (Mercruiser site). Maybe some serials number have
indeed the hardened exhaust valve seats, and some not. This is what I
am trying to find out...

Greatings,
Dimitris.

i think that un-leaded fuel should be fine in those years. seeing that
un-leaded was just about a mandatory by 1978 and event though boats
were exempt, by the time your years have come around, the marine
industry was pretty well set up for un leaded fuels.

I really don't think you'll have a problem.

Tim