Aussie 47 mercury

[DanS]

Thanks Geoff, I will get these engines apart and see what I've got. One other funny thing, I spent weeks soaking, heating and slowly got head studs out of one. Unfortunately broke 4. Still figuring out how to get them out!
The other 69a every head stud just undid with the nuts! Just wondering if this is a concern? When about halfway out some studs felt loose, even a bit wobbly.