As previously noted, the clutch is all about TORQUE, and torque capscity of the cluch must be greater than maximum torque output of the engine. This page will list for comparison known engine power and torque numbers along with known clutch torque capacity numners.

Clutch Kit Part No.	Car Model	Engine Crankshaft Torque	Clutch Friction Limit	Total Spring Load	Manufacturer	Data Source
A6-G (8in)	MGA 1500	77.4 lb-ft @ 3500 rpm		Black/Yellow Cr/Lt Green com(e)16225	Borg & Beck	1
A6-G (8in)	MGA 1600	87 lb-ft @ 3800 rpm		Cr/Lt Green	Borg & Beck	1
8A6-G (8in)	MGA 1600-MK-II	97 lb-ft @ 4000 rpm		Lt Grey 1200 Lb	Borg & Beck	1
8ARG (8")	MGA Twin Cam	105 lb-ft @ 4500 rpm	100 lb-ft * (Calculated)	Lt Grey 1200 Lb	Borg & Beck	2
GCK109	MGB 1971 UK spec	105 lb-ft @ 2500 rpm		Bk/Lt Green	Borg & Beck
KT9694	MGB Standard				AP	3
KT9679	MGB Heavy Duty				AP	3
KT9679 sold as GCK109HDR	MGOC Heavy Duty		130 lb-ft or 176 Nm		AP / AP Racing	4
CP2000-3NB (CP2246-71 cover ass'y)	MGB Tourer and GT 1962-1981	Racing Application	165 lb-ft or 224 Nm	White 1200 Lb	AP Racing	5
Information Sources: *.) Clutch torque for Twin Cam taken from Data Book may be wrong. 1600-MK-II uses same springs. AP Racing application clutch has same clamping force and 165 lb-ft torque capacity. Clutch torque MUST be greater than engine torque. 1.) MG Series MGA Workshop Manual Sec F.2 Sht.2 2.) Engineering Technical Data book TD/G.1. Sec F.2 Sht.2 3.) http://www.apclutch.it/pdf/vehicle_applications.pdf 4.) MGOC Spares Catalog 5.) AP Racing web site