GUSTO14

I pulled this water pump off of the 327 that is in my '63 Corvette. The car has been in storage for the past 36 years and I can't recall if it is the original pump or if I changed it back then. The casting number is 3739483 and it has the bypass fitting in the top of the pump. The pump is in good shape and I was wondering if it is worth having it rebuilt or should I just replace it with a new modern casting.

Can anyone tell me anything about this particular pump?

Thanks, GUSTO

Nowhere Man

whats the casting date and when was your car built?

GUSTO14

Thanks for the reply... I'll look for a casting date on the pump, but the car was built in September 1962... #396.

GUSTO

Donald #31176

I believe the casting # for the 63 model year waterpump is the same as the one used in 62. The 62 casting is #3782609.

GUSTO14

Thanks Donald... this pump is definitely not a 609...

Nowhere Man, I can not find any markings on the pump besides the GM 8 and the #3739483... (although it is possible that the 9 is a 0)

It seems likely it is a pump that I installed sometime in the late 60's before putting the car in storage.

GUSTO

Donald #31176

Gusto,
Take another look at that casting.The water pump casting # used on 58-60 C-1s is #3736493.

GUSTO14

Donald, what I thought was a 9 could be a 6 and the 8 could be a 9. If that were the case then clearly it is not original to my '63.

One other interesting thing I've never seen before on a SB water pump is that it has one "weep" hole on top of the shaft and two "weep" holes side-by-side underneath the shaft.

Thanks for your help... GUSTO

abe g

Its not very complicated. My 63 swc 340 hp was built in October 62, and I recently replaced the original pump with an exact model from Nappa. Cost was $80 for a new one. Original lasted all this time went to leaking slightly at 90000 miles. Kept the old one for rebuild for next owner. Regards, Abe G