The diaphragm type was easier to hold the clutch in like at a stop sign/light.
The holding ability was acceptable.
The B&B type generally needed a he-man leg to hold the clutch in if it was a HD type.
The holding ability was greatly enhanced.
(no slipping when running, good for racing)
The other not sure about seemed to be a Ford thing.
__________________
John Wallace - johnta1
Pontiac Power RULES !!!
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