It easy enough. They are behind the intake
manifold. The valves will come right out for
O ring replacement. Its best not to switch
them. If the old ones break apart when you
remove them your motor probably
wouldn’t have started. This is a 75 TS but
should be similar to your 60.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.