48-52 nm for the long bolt
Upper wishbone ball joint: 43-47Nm
Some wish bones come pre-greased others don't so that's why there is some confusion.
If in doubt, red rubber grease like this:
Is ideal for greasing the bushes.... Or you will be changing them again sooner than you thought
While you are at it, Arm yourself with an angle grinder with a 4" cutting disc, a file and a new pair of upper wishbone bolts and nuts from a dealer (about £11.00)or so
No need to even remove the strut or pinch bolt at the bottom or even the drop link... Remove the plastic inner wheel arch protector... 4-5 screws and a bit of gentle persuasion past the wing lip. Loosen the alarm box passenger side from the void via the engine bay inner wing (two bolts) and do the same to the EVAP canister on the drivers side to get much better access.
Undo the ball joint and push the wishbone all the way down.
Loosen the main bolt on the upper wishbone but don't remove the nut totally push the bolt along and you will notice the bolt head will end up trapping itself against the coil spring
(thus the laborious and pointless task of having to remove the suspension strut)... Use the angle grinder and cut the bolt head off... Now file down the swarf while turning the bolt shaft and using pliers pull the remaining bolt shaft through the opposite way out from the nut side...
Replace your new wishbone (greased up already) Now push the main wishbone bolt all the way through from the opposite direction so the nut is now towards the coil spring instead... Torque it up. Fit the ball joint back into the upper hub leg and torque that up...
Refit the Evap canister and alarm box back into position and refit the wheel arch liner back into position... Job done 30 minutes per side and even quicker next time around as no grinding/ cutting required
Or you can do it the standard way and end up destroying a drop link or two along with a seized in pinch bolt that will need drilling out if rounded, No need to disturb the top suspension mount either and 2.5 hours per side labour if you are lucky with bolts and links coming out as they should etc.
To answer any doubts:
No... The new bolt threads when put in the opposite direction will NOT
touch the coil spring!
No... There is no safety issue
with using it in the opposite way... I checked with Alfa Romeo master technician's first and I asked that very question... The only reason why it was fitted bolt head to spring was that they built the suspension and sub frame complete before mating it to the car at the factory.
No... You will not need your suspension geometry checking afterwards as you haven't disturbed it at all. The original process it was always advised to do so since half the suspension was removed and position changed!
Easy way and a hard way... Your choice, but done I've done this about forty plus times now and NO issues with it