Hi flow water and oil pump

[opto]

How do I determine weather or not the waterpump is a high volume pump when looking at the pump?

Same question for the oilpump.

[Dieselboy]

If other than the turbo your engine is stock, then it's unlikely that you have either.

A Pen 100 GPM CW rotation pump has no markings on it different from a stock GM pump. A 97+ 130 GPM CCW rotation pump has "HO" stamped on it near the 12 o clock position.

IIRC, high volume oil pumps were introduced in 97 with oil spray pistons. It looked the same as my old 6.2L pump when I installed one.

[opto]

Yepp mine are not but I had a look at some used not used part that are supposed to come from a 6,5 -99, so I figuered I would like to know what it is. smile.gif

[opto]

By the way, is that CCW seen from front of engine?

[Dieselboy]

Yup. As if you were standing at the grill looking at the engine. V-belt water pumps turn CW, and serpentine CCW.