Your Dad maybe a little off.....
The Old Tin Can "NoBones" had a 1980 75 HP Johnson Stinger that had
well over 2700 hours of use before it quit... No pics, sorry to say..
The 1968 Seamaster had 550 hours before it's untimely death in 1980...
The old saying goes, If you take care of it, It will take care of you!!
Age and hours mean nothing if you just adhere to the above simple rule!