Water pump casting numbers
Thread Starter
Cruising
Joined: Sep 2012
Posts: 11
Likes: 4
From: Bradenton Florida
Water pump casting numbers
I know the standard casting number for GM water pump's is 3782608.
Above that number on my pump is "GM 26"
I am trying to determine if this pump is original or if it is a replacement by the original owner.
Does anyone know what the number alongside the "GM" letters stands for?
Above that number on my pump is "GM 26"
I am trying to determine if this pump is original or if it is a replacement by the original owner.
Does anyone know what the number alongside the "GM" letters stands for?
Thread Starter
Cruising
Joined: Sep 2012
Posts: 11
Likes: 4
From: Bradenton Florida
Does that mean my water pump is a replacement? and the original pump would have had a lower pattern number?
I can't find a date on my W.P. casting, so how do I know what number matches when my vette was built (1970 L46 that was manufactured in July of 1970). Or am I getting too picky??
Team Owner
Joined: Sep 2006
Posts: 31,198
Likes: 4,287
From: Westminster Maryland
Hi V_N,
Yes, you're right, there were multiple patterns.
I believe your 70 water pump should have 3782608 as the casting number... we'll worry about that before the date. Is that the #?
Regards,
Alan
Yes, you're right, there were multiple patterns.
I believe your 70 water pump should have 3782608 as the casting number... we'll worry about that before the date. Is that the #?
Regards,
Alan
Last edited by Alan 71; Sep 29, 2012 at 07:23 PM.
Thread Starter
Cruising
Joined: Sep 2012
Posts: 11
Likes: 4
From: Bradenton Florida
Based on the C3registry.com, my vette was assembled on July 16, 1970.
I need to replace my pump - broke it in the process of installing the new internal components (bearing and seal).
Thanks for the help,
Dan
