Quote:
Originally Posted by 'ol Pinion head
There were at least 5 different factory design cast impellers used on late '63-81 Pontiac waterpumps.
-late deeper recess impellers on the last casting of 11 bolt pumps
-abbreviated vane used on 301 & 265 pumps (utilized as the hard block 400-455 impeller)
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Pic on the left is a NOS in the GM box 265-301 pump PN 12309445
Pic on right is a later NOS 400-455 pump PN 488377
The pic of the 301 pump isn't the greatest but the vanes look the same. Am missing something? Can you explain abbreviated vane?