Most modern cars (Not sure if Morgan has caught up) specify between 80-85 ft lbs. At the track most recommend running 85-90 ft lbs. Is there a reason Morgan would be much lower? The studs shouldn't stretch unless they're just bad metal.

I have spin ons.

1960 Morgan +4 4 seater
1997 Nissan 240sx S14
2011 Nissan 370Z
2009 Triumph Street Triple