Vic---I don't know what the SC differences are between the four and the six,
but the Triumph factory must have felt the self adjusting later design was
better. The later SC, with its internal spring, keeps all of the play out of
the linkage between the SC pushrod up to the clutch fingers. Apparantly the TR4
needed to have this rod adjusted when play developed in the clutch mechanism.
No such adjustment is needed with the six. However, if there is play in the
linkage down in the pedal box, it must be corrected to get the full stroke of
the clutch pedal. (The adjustable pushrod will not get back this lost motion).
The question might be: Would the later SC be a better choice for the TR3/4? (I
don't know the bore size, bolt flange dimension, etc.)
Dick
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