I used to know what torque setting to use on spark plugs for aluminum heads but I've forgotten. Anybody know?
Better yet, http://www.flatheadv8.org/Headbolts.pdf Oops! You said aluminium heads. Above is for factory heads. Sorry.
1] According to http://www.nology.com/torque.html Aluminum heads with 14mm = 18-22 lb. ft.... with antiseize on threads 2] According to http://www.vanpeltsales.com/FH_web/flathead_torquespecs32-48V8.htm Aluminum heads with 14mm = 20-24 lb. ft