Top Quality Early Style Japanese 1600 pump. This pump fits the 65-67 3-main engine correctly:

Shaft does not protrude thru the metal 4-blade fan- no need to hack-up your OEM metal fan.

Short stud mount for early 3-main 1500 and 1600  - replace that tired cast iron pump.
 
We suggest you avoid the Ebay pumps, there is all kinds of incorrect H20 pumps out there that don't fit.
 
Direct bolt on.  Engine block stud change not required which is typically a nightmare!
 
Cast Impeller.   Fan fasteners included.