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Reading up on the subject, just realized there is another factor to look at. In 1970 Ford changed the water inlet from Right to left so the pump has to be a pre-70. I think you could use the early 302 Boss (C9ZZ-A) as it is high flow.

I am sure Steve knows this answer and surprised he has not chimed-in Smiler
Denis
.....was sleeping at the wheel.....

Paolo, the idea of keeping the original really only makes sense if your pump IS the original. I'm talking proper 68 casting number on the steel, and a date code that matches your heads, block, flywheel, distributor, carb..... you get the idea! If it doesn't match, and I would be very surprised if it did....being that this is a part that probably gets replaced due to failure.....but, ya never know, so if it doesn't have proper numbers on it, then it is just good for a core..... OR if the date is later than the rest of the stuff by a large margin, then perhaps it would match someone elses car! ...or a Mustang!

Since no one could ever see your water pump as installed, you would never lose any points at a judged car show either!

For all practical purposes, you can replace your pump with a conventional cast iron pump. No need to try and get fancy, as the stock pumps work great.

Stick with the 68-69 pump.

The 70 thing that Denis mentioned shouldn't apply as there isn't enough room at the front of the engine to put in a 70 pump with the swapped inlet easily. See picture...70 pump would put both water pipes on same side of engine (LH side- RH in pic!) and that is tight! Don't ask how I know this....!

If the pump is suspect, look for the hole on the bottom of the pump snout. There is a good 5/16" hole where water will come out of if the sealed bearing is going bad. You may need to use a "mirror on a stick" to get in and see.... Try and track down any evidence of water path....if it is coming straight down the center of the pump and perhaps hitting the crank pulley, then I would suspect that hole is leaking water. If it is coming from a hose above the pump, then I would expect to see water trails above the water pump pulley.....

Cheers!
Post some pictures of your car too! Not often we hear from cars in the 600's! (..or 500's!)

Note the brass adapter ring on the center post of the water pump. Some cars got industrial engines and pumps..which had a larger post. DeT apparently cut the pump pulleys with the larger hole.....! SOME rebuilt pumps come with this adapter....I just happened to find a pump in my stock pile that had this adapter piece in it, so I put it to use!!! I had never seen one previously..... Also, my pulley bolted up fine without the adapter, but the 12 point bolts that were on it may have had bevels/radius's on the backside of the heads to help center it....
Steve

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