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The difference in the push/pull clutches is not the arm but the way the pressure plate/release bearing works. Push clutches are just like a "normal" clutch, the release bearing pushes on the pressure plate (toward the flywheel) to release the disk. Pull clutches have the release bearing attached to the pressure plate and the arm pulls the release bearing (away from the flywheel) to release the clutch.
I have heard that the 915 trans (also uses the pull clutch) has successfully been converted to the early 901 type clutch but I don't know the specifics. When I measured my 915 and 914 clutch/flywheel I found it would not fit inside the bellhousing so I sold the 915 and bought a 902 5 speed from a '69 912 (just like a 901).
ken
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