01E Slave Cylinder Piston Diameter?

I'm looking to find the piston diameter of the 01E clutch slave cylinder.

My symptom is a clutch pedal too close to the end of travel before clutch disengagement. I'm using a 3/4" bore Wilwood clutch master which should be adequate taking into account the appropriate ratios, etc.

The 01E clutch slave is forward sprung, so theoretically the TOB should always be in slight contact with the pressure plate fingers and should result in immediate activation. I don't believe there's any air in the system, as I did (Several times) both a manual and a power bleed; the pedal does not pump up.

I read in another thread on this forum about residual pressure valves and their influence on a braking system when the master is positioned lower than the calipers. Would a low pressure valve (2 lb) help in my case in the event there's some sort of drain-back occurring? I already have the valve, so I could pumb it in, but am soliciting an opinion first.

Thank you,

Andy
 
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