| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,139 Posts1,056,756 Members48,454 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jun 2007 Posts: 39 'Bolter | | 'Bolter Joined: Jun 2007 Posts: 39 | hope somebody can help me. i may need to replace the water pump. don't know if it is a short shaft or regular. from block to fan blade is approximately 7" i can't read all the castings number on the pump, but it looks like 323409 gm5 or 939403?? but these numbers don't match up to any water pump numbers i run across. any help out there for me?? | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | If your engine is a '55 first series or earlier you need the water pump for that engine. If it is a '55 2nd or later engine you need a pump for that engine which has been shortened. If you are using that one you already have the right pulley and you don't need to pay the ridiculous price they ask for a "short shaft water pump". You can buy a stock one from flaps, press the pulley mount to where you need it and cut off the excess yourself.
Post your block casting numbers. | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
53-55st water pump should have the same size pulley groove? 3/8"
| | |
|
|
| |
