Hi Jonny,
I have successfully lowered my 1976 P6 V8 courtesy of some great advie from this site.......one of the readers in NZ had lowered his car and the advice that he gave was great.
I measured my car against other standard P6 Rover in Sydney and the rear is now 1" closer to the ground via lowered springs and the front is 2" lower via trimming the rod between the upper control arm and the spring.
The rear springs were stiffened as the car was bottoming out under load after we first lowered the car.
Do not go any lower than these measurements especially the back......the car looks simply fantastic lowered and adding the bilstein shocks has also made a BIG difference....I am about to upgrade the tyres to a 195/65/14 .....either Yokohama A539, Michelin MXV8 or Pirelli P6000....I think I will probably go with the Yokohama as they are sticky tyres....I am not worried about great milage tyres.........my current Pirelli P400 tyres are not giving me sufficient grip, especially in the wet...I want to keep my original wheel covers as they look great with the thin whitewalls that I had added....which I will again do with the new improved tyre package.........the wheel covers also maintain some resemblence of originality about the car so no wish to add low profile tyre and wheels....plus I do get a lot of nice comments abou the covers and the whitewalls (give it some thought !!!....lower the car first and then decide on changing the wheel size)
Email me if you cannot find the NZ article on this site.
Good luck
GULLY (In Sydney)
I have also added Bilstein shocks to the car and the front factory sway bar has been slightly enlarged which has significantly improved the handling of the car.
I am very pleased with the tougher appearance of the car now that it has been lowered.