What is it?
Attached are two pics of a water pump set up.
The casting number on the housing is 1671895. Above it is the number 4. following that like a tag is a PF. There are also other letters and numbers.
On the impeller piece is the casting PH 154
Thanks

Kind of looks like an industrial or truck application.

The housing looks like a Chevy but the pump doesn't, it looks like BB Mopars

BB WP housings have two holes on each side.

Pump is not bb mopar. Too many bolt holes.

i have pics somewhere, [but maybe not on this 'puter] but i just looked on the shelf to confirm my memory.
i believe that housing could be a 392 hemi. they have the single hole inlets to the heads, and the single large upright [not the heater hose barb] barb is a bypass to the intake manifold.
what size diameter is the water pump housing ? the hemi pump diameter is larger than a big block pump, which is roughly 5" [ish].
a front side pic of the housing, along with some measurements [like bolt hole center to center, etc.] will confirm my suspicions.



edit : the casting numbers on the housing do not match anything i have on the early hemi, however. this still doesn't mean that housing is not for an early hemi. measurements will help.

another thing. the early hemi also has 4 attaching bolts for the water pump like the big block, so now i just don't know what to think..........

Appears to `69-`73 Dodge M300 motor home with big block engine , w/p p/n 3420225 with 5/8" pilot. Paul