1961 cadillac water pump and gas filler door

[kurzzy69]

I am looking for an original water pump for a 1961 Cadillac 390 non a/c car and a gas filler door.

Thanks in advance!!

[Bobby B]

Few pumps on eBay that need rebuilding......
                                    Bobby

https://www.ebay.com/itm/1961-Cadillac-Water-Pump-CORE-Casting-30355-thin-fan-boss-B/264350009281?hash=item3d8c7d07c1:g:WigAAOSwj7Nc7bw8

https://www.ebay.com/itm/1961-Cadillac-Water-Pump-CORE-Casting-30355-thick-fan-boss-A/372684165118?hash=item56c5b50ffe:g:lqwAAOSwan5c7bkp

[kurzzy69]

Thanks Bobby! Do you know why there are different bosses on each of them?

[Bobby B]

My guess would that it has to do with the backspacing of the pulley that gets mounted to it. Maybe additional accessories might require a double pulley and the use of the "thicker" boss pump would offset the belts to the required positions so they line up. Why not post that question on the Technical Forum. Someone will know right away what's up. Just post "Difference between a thick/thin boss water pump on a 1961 390 engine". Maybe the seller doesn't even know what he's selling in the ad. Good luck!
                                               Bobby

[kurzzy69]

Thanks Bobby, appreciated the info. I will post out there and see what I get.

Thanks again!

[Bobby B]

Regarding the replies, it must be used for either a double/ single pulley if it has AC or not, as I guessed. Do you have the original pump to compare? Try Google for some engine bay pictures and do some research. You'll figure it out. Good Luck!
                                                                                                         Bobby