The oem oil pump drive shaft twists & absorbs shocks, but the heavy duty oil pump drive shafts don't twist so the pins shear off.
The twisting of the oem shaft causes "spark scatter", the heavy duty shaft was desinged to prevent spark scatter.
If you can put up with spark scatter, use the oem shaft and it becomes a non-issue.
Better yet, install a distributorless ignition, use the oem drive shaft, and you have neither spark scatter or sheared distrubtor gear pins.
-G
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