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There were actually 3 different pumps in the series.
Original "early" pump - discontinued. Notorious for faiure. Very few of these are still around.
"mid" pump: Improved early pump, thermostat not set as deeply. Reliability greatly improved. This is the "early pump" that is common now.
"late" or "Turbo" pump. Improved design, greater reliability. Had the provision for connecting a water feed for the turbocharger, or a block off plate for NA vehicles.
The "late" or Turbo pump is, overall, the best pump. Reliability is better. However, if you have an early pump, you must purchase an update kit - a belt guard, improved roller, and templates for cutting the rear belt cover to make room for the updates.
Other considerations: If you have an early pump, you probably have a power steering line attached to it. you will have to update your power steering line (feed line) to the newer version to accomodate a late pump.
AFJuvat
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