I am buying a new water pump for my 455 winter modification project, I do not have the engine right now as it is currently at the machine shop. I should have checked my water pump before dropping it off. Can someone clarify the difference of lengths?



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Depends on what year and if you have A/C. Search water pumps. there are a lot of threads discussing the sizes and what they are for.

 

Check out this thread:

https://classicoldsmobile.com/forums...p-lengths.html