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ok on my 1995 oval port cyl head ( omc part no 339221) the pocket depth from standard is 13.5 mm..... SST60 spec is minimum 11.176mm.
depth of thermostat hole on oval port head is 6mm. and thickness at bottom hole on cyl head is also 6mm. (photo to show bottom hole.)
so for me to have sst60 spec i need to shave off 2.324mm... this would still leave me with 3.676mm of metal at thermostat.
Also I just noticed on the front of the head just above no2 plug and under the omc M is a letter L on the casting, it sticks up a touch so is there from new.
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