Clutch spring colour codes - Complimets of John Lambie, Classic Spares

Clutch pressure plate  7-1/4 inch  (six springs)
MG TC           Yellow          120 lbs
                Red             130 lbs
                light blue      150 lbs

Clutch pressure plate   8 inch     (six springs)
MG TF Midget    brown           150/160 lbs
MGA 1500        black/yellow    165/175 lbs   to eng. # 16225
MGA 1500        cream/green     180/190 lbs
MGA 1600        light grey      195/205 lbs   (MG TF Midget competition clutch)
MGA Twin Cam    light grey      195/205 lbs   (Spring rate = 282 lb/in)

*Note:  Twin Cam pressure plate is different construction from other MGA models.
MGA 1600 has Borg & Beck clutch 8A6-G.   Twin Cam has B & B clutch 8ARG.
Same springs do not necessarily produce same force throughout the operating range.

Clutch driven plate damper springs
MGA 1500        white with light green stripes
MGA 1600        Maroon and light green
MGA Twin Cam    Maroon and light green

Clutch Kits List - Compliments of Mark Harris
                                            Friction Limit
Kit Part#     Model              Torque       (Torque)       Manufacturer   Source
                                 105 ft lbs   100 lb/ft                       *1
              MGA Twin Cam       @ 4500 rpm   - Calculated   Borg & Beck
                                 105 ft lbs 
GCK109        1971 UK spec MGB   @ 2500 rpm                  Borg & Beck
KT9694	      MGB - Standard                                 AP               *2
KT9679	      MGB - Heavy Duty                               AP               *3
KT9679 sold-                                  130 ft lbs
as GCK109HDR  MGOC - Heavy Duty               or 176 Nm      AP / AP Racing?  *4
                                              165 ft lbs 
CP2000-3NB    MGB AP Racing                   or 224 Nm      AP Racing        *5
  Sources:
  *1  From engineering technical data book TD/G.1
  *2  http://www.apclutch.it/pdf/vehicle_applications.pdf
  *3  http://www.apclutch.it/pdf/vehicle_applications.pdf
  *4  http://www.mgocaccessories.co.uk/acatalog/MGOC_Accessories__Tuning_37.htm
  *5  http://www.apracing.com/info/search.asp?keyword=MGB