Question 1

is it a high volume pump?

Accepted Answer

It says High Performance and High Flow But It does not say High Volume.
Ames Performance Sells these two:
NEW MILODON HIGH PERFORMANCE LIGHT WEIGHT ALUMINUM WATER PUMP W/GASKETS. 4.5" HUB,11 BOLT $114
NEW PUMP W/FLOW KOOLER IMPELLER MODIFICATIONS. ALUMINUM PUMP W/CAST IMPELLER. THIS PUMP IS THE LATER 4 1/2" HUB FOR 1969. USE N140LW THERMOSTAT WITH THIS PUMP.GASKETS INCLUDED. This one has 16 Fins on the back of the impeller. $135
I got this info from ROCKAUTO:
GMB 1301280P
High Performance
Features:

High flow design provides long lasting, efficient cooling
Factory lubricated for long life
Easy Installation
Precision ground shaft and hub accept OE fan clutches perfectly
OE quality forged housing is specially formed to ensure maximum coolant flow
Precision built and balanced - Pressed on impeller increases water flow
Unitized seal protects bearings - Provides long life and leak free performance
Factory sealed, precision ground one piece bearing assembly
NOTE: It is recommended to replace your Radiator Fan Clutch & Water Pump at the same time. The two parts age at the same rate so if one has failed, the other is probably not far behind. The fan clutch and water pump are also connected by the same shaft. When one part fails it typically affects the operation of the other. To prevent premature failure of your new unit, it is wise to replace both at the same time.

Mounting Hardware Included	No
Pulley Type	Flange
Pulley Included	No
Gasket or Seal Included	Yes
Mounting Hole Quantity	11
Housing Material	Aluminum
Impeller Material	Metal
Impeller Rotation	Standard
Includes Back Housing	No
Water Pump Drive Type	Accessory Belt
Impeller Vane Quantity	8
Impeller Outside Diameter (in)	3.78
Hub Height (in)	4.52

GMB Warranty Information:
12 month/12,000 miles
So to answer your question, No where on the box or paper work does it say High Volume. GL

Question 2

A review below, stated this was a short neck.  What were they referring too?  Thanks

Accepted Answer

"Short neck" refers to the hub height. We used to carry a short neck version, which was ~3.96" hub height (GMB# 130-2912). It was obsoleted a few years ago though.

130-1280 would be the "long neck" version. It is around 4.5" hub height.
So, i'm not sure why the reviewer said this was a good short neck pump, since this is the long version??? Anyway, just double check the hub height the make sure it's the correct one you need.

Question 3

Is the impeller stamped steel or cast?

Accepted Answer

It does't say but it looks like its CAST. GL

Question 4

Does this water pump have a cast iron or aluminum body?

Accepted Answer

Cast iron pump and iron impeller. Hi flow version. Same as "high performance " you get at speedshops.

Brand	GMB
Material	Aluminum, Cast Iron
Item Weight	5.2 Pounds
Weight Class	Heavy Weight
Global Trade Identification Number	00083286530287
Manufacturer	GMB
UPC	083286530287
Model	130-1280P
Item Weight	5.2 pounds
Product Dimensions	11.8 x 7.8 x 7.5 inches
Country of Origin	Thailand
Item model number	130-1280P
Exterior	Machined
Manufacturer Part Number	130-1280P

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GMB130-1280P High Performance Series Water Pump with Gasket

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